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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A9A9F73A4A2C8AF51B878114F8B67FC2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A9A9F73A4A2C8AF51B878114F8B67FC2" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A9A9F73A4A2C8AF51B878114F8B67FC2" xlink:type="arc" />
    <link:label id="lab_mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock_19027BA176888B2BD6E78114F8B62675_terseLabel_en-US" xlink:label="lab_mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock_19027BA176888B2BD6E78114F8B62675" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred Compensation</link:label>
    <link:label id="lab_mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock_19027BA176888B2BD6E78114F8B62675_label_en-US" xlink:label="lab_mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock_19027BA176888B2BD6E78114F8B62675" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred compensation policy text block [Policy Text Block]</link:label>
    <link:label id="lab_mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock_19027BA176888B2BD6E78114F8B62675_documentation_en-US" xlink:label="lab_mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock_19027BA176888B2BD6E78114F8B62675" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of accounting policy for deferred compensation plan.</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock" xlink:label="loc_mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock_19027BA176888B2BD6E78114F8B62675" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock_19027BA176888B2BD6E78114F8B62675" xlink:to="lab_mmsi_DeferredCompensationPolicyTextBlockPolicyTextBlock_19027BA176888B2BD6E78114F8B62675" xlink:type="arc" />
    <link:label id="lab_mmsi_OtherAssetsPolicyTextBlockPolicyTextBlock_B44475364BE7D724EE228114F8B6E8A4_terseLabel_en-US" xlink:label="lab_mmsi_OtherAssetsPolicyTextBlockPolicyTextBlock_B44475364BE7D724EE228114F8B6E8A4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets</link:label>
    <link:label id="lab_mmsi_OtherAssetsPolicyTextBlockPolicyTextBlock_B44475364BE7D724EE228114F8B6E8A4_label_en-US" xlink:label="lab_mmsi_OtherAssetsPolicyTextBlockPolicyTextBlock_B44475364BE7D724EE228114F8B6E8A4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets Policy Text Block [Policy Text Block]</link:label>
    <link:label id="lab_mmsi_OtherAssetsPolicyTextBlockPolicyTextBlock_B44475364BE7D724EE228114F8B6E8A4_documentation_en-US" xlink:label="lab_mmsi_OtherAssetsPolicyTextBlockPolicyTextBlock_B44475364BE7D724EE228114F8B6E8A4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of accounting policy for other assets which are expected to be realized or consumed after on year (or the normal operating cycle, if longer).</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_OtherAssetsPolicyTextBlockPolicyTextBlock" xlink:label="loc_mmsi_OtherAssetsPolicyTextBlockPolicyTextBlock_B44475364BE7D724EE228114F8B6E8A4" xlink:type="locator" />
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    <link:label id="lab_mmsi_DeferredCreditsPolicyTextBlock_B9208FD767D6A987D8E08114F8B66FA5_terseLabel_en-US" xlink:label="lab_mmsi_DeferredCreditsPolicyTextBlock_B9208FD767D6A987D8E08114F8B66FA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred Credits</link:label>
    <link:label id="lab_mmsi_DeferredCreditsPolicyTextBlock_B9208FD767D6A987D8E08114F8B66FA5_label_en-US" xlink:label="lab_mmsi_DeferredCreditsPolicyTextBlock_B9208FD767D6A987D8E08114F8B66FA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred credits [Policy Text Block]</link:label>
    <link:label id="lab_mmsi_DeferredCreditsPolicyTextBlock_B9208FD767D6A987D8E08114F8B66FA5_documentation_en-US" xlink:label="lab_mmsi_DeferredCreditsPolicyTextBlock_B9208FD767D6A987D8E08114F8B66FA5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of accounting policy for deferred credits consisting of grant money received.</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_DeferredCreditsPolicyTextBlock" xlink:label="loc_mmsi_DeferredCreditsPolicyTextBlock_B9208FD767D6A987D8E08114F8B66FA5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mmsi_DeferredCreditsPolicyTextBlock_B9208FD767D6A987D8E08114F8B66FA5" xlink:to="lab_mmsi_DeferredCreditsPolicyTextBlock_B9208FD767D6A987D8E08114F8B66FA5" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_C2538E200C5641925C868114F8B6EEB2_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock_C2538E200C5641925C868114F8B6EEB2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue Recognition</link:label>
    <link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_C2538E200C5641925C868114F8B6EEB2_label_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock_C2538E200C5641925C868114F8B6EEB2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue Recognition, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="loc_us-gaap_RevenueRecognitionPolicyTextBlock_C2538E200C5641925C868114F8B6EEB2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRecognitionPolicyTextBlock_C2538E200C5641925C868114F8B6EEB2" xlink:to="lab_us-gaap_RevenueRecognitionPolicyTextBlock_C2538E200C5641925C868114F8B6EEB2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShippingAndHandlingCostPolicyTextBlock_8F067711A657195FEF978114F8B69369_terseLabel_en-US" xlink:label="lab_us-gaap_ShippingAndHandlingCostPolicyTextBlock_8F067711A657195FEF978114F8B69369" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shipping and Handling</link:label>
    <link:label id="lab_us-gaap_ShippingAndHandlingCostPolicyTextBlock_8F067711A657195FEF978114F8B69369_label_en-US" xlink:label="lab_us-gaap_ShippingAndHandlingCostPolicyTextBlock_8F067711A657195FEF978114F8B69369" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shipping and Handling Cost, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShippingAndHandlingCostPolicyTextBlock" xlink:label="loc_us-gaap_ShippingAndHandlingCostPolicyTextBlock_8F067711A657195FEF978114F8B69369" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShippingAndHandlingCostPolicyTextBlock_8F067711A657195FEF978114F8B69369" xlink:to="lab_us-gaap_ShippingAndHandlingCostPolicyTextBlock_8F067711A657195FEF978114F8B69369" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostOfSalesPolicyTextBlock_5F781DAF580ED3463BF08114F8B62D05_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfSalesPolicyTextBlock_5F781DAF580ED3463BF08114F8B62D05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of Sales</link:label>
    <link:label id="lab_us-gaap_CostOfSalesPolicyTextBlock_5F781DAF580ED3463BF08114F8B62D05_label_en-US" xlink:label="lab_us-gaap_CostOfSalesPolicyTextBlock_5F781DAF580ED3463BF08114F8B62D05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Sales, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfSalesPolicyTextBlock" xlink:label="loc_us-gaap_CostOfSalesPolicyTextBlock_5F781DAF580ED3463BF08114F8B62D05" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfSalesPolicyTextBlock_5F781DAF580ED3463BF08114F8B62D05" xlink:to="lab_us-gaap_CostOfSalesPolicyTextBlock_5F781DAF580ED3463BF08114F8B62D05" xlink:type="arc" />
    <link:label id="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_16739BD560B962241B688114F8B6D61D_terseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_16739BD560B962241B688114F8B6D61D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Research and Development</link:label>
    <link:label id="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_16739BD560B962241B688114F8B6D61D_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_16739BD560B962241B688114F8B6D61D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Research and Development Expense, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ResearchAndDevelopmentExpensePolicy" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpensePolicy_16739BD560B962241B688114F8B6D61D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResearchAndDevelopmentExpensePolicy_16739BD560B962241B688114F8B6D61D" xlink:to="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_16739BD560B962241B688114F8B6D61D" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_59B00403385B7553AE8A8114F8B6FCCB_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_59B00403385B7553AE8A8114F8B6FCCB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_59B00403385B7553AE8A8114F8B6FCCB_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_59B00403385B7553AE8A8114F8B6FCCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_59B00403385B7553AE8A8114F8B6FCCB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxPolicyTextBlock_59B00403385B7553AE8A8114F8B6FCCB" xlink:to="lab_us-gaap_IncomeTaxPolicyTextBlock_59B00403385B7553AE8A8114F8B6FCCB" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_D0D175ADA32BDE1267588114F8B6350B_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock_D0D175ADA32BDE1267588114F8B6350B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings per Common Share</link:label>
    <link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_D0D175ADA32BDE1267588114F8B6350B_label_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock_D0D175ADA32BDE1267588114F8B6350B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock_D0D175ADA32BDE1267588114F8B6350B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerSharePolicyTextBlock_D0D175ADA32BDE1267588114F8B6350B" xlink:to="lab_us-gaap_EarningsPerSharePolicyTextBlock_D0D175ADA32BDE1267588114F8B6350B" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_C253675A358B0EB8D9D28114F8B77B8E_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_C253675A358B0EB8D9D28114F8B77B8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurements</link:label>
    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_C253675A358B0EB8D9D28114F8B77B8E_label_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_C253675A358B0EB8D9D28114F8B77B8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value of Financial Instruments, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:label="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_C253675A358B0EB8D9D28114F8B77B8E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_C253675A358B0EB8D9D28114F8B77B8E" xlink:to="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_C253675A358B0EB8D9D28114F8B77B8E" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_3479B91FED452BD01DD08114F8B7D20C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_3479B91FED452BD01DD08114F8B7D20C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-Based Compensation</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_3479B91FED452BD01DD08114F8B7D20C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_3479B91FED452BD01DD08114F8B7D20C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:label="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_3479B91FED452BD01DD08114F8B7D20C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_3479B91FED452BD01DD08114F8B7D20C" xlink:to="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_3479B91FED452BD01DD08114F8B7D20C" xlink:type="arc" />
    <link:label id="lab_mmsi_ConcentrationOfCreditRiskPolicyTextBlock_38EB18B0AE36163D55958114F8B75648_terseLabel_en-US" xlink:label="lab_mmsi_ConcentrationOfCreditRiskPolicyTextBlock_38EB18B0AE36163D55958114F8B75648" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Concentration of Credit Risk</link:label>
    <link:label id="lab_mmsi_ConcentrationOfCreditRiskPolicyTextBlock_38EB18B0AE36163D55958114F8B75648_label_en-US" xlink:label="lab_mmsi_ConcentrationOfCreditRiskPolicyTextBlock_38EB18B0AE36163D55958114F8B75648" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Concentration of Credit Risk [Policy Text Block]</link:label>
    <link:label id="lab_mmsi_ConcentrationOfCreditRiskPolicyTextBlock_38EB18B0AE36163D55958114F8B75648_documentation_en-US" xlink:label="lab_mmsi_ConcentrationOfCreditRiskPolicyTextBlock_38EB18B0AE36163D55958114F8B75648" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of accouting policy for concentration of credit risk.</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_ConcentrationOfCreditRiskPolicyTextBlock" xlink:label="loc_mmsi_ConcentrationOfCreditRiskPolicyTextBlock_38EB18B0AE36163D55958114F8B75648" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mmsi_ConcentrationOfCreditRiskPolicyTextBlock_38EB18B0AE36163D55958114F8B75648" xlink:to="lab_mmsi_ConcentrationOfCreditRiskPolicyTextBlock_38EB18B0AE36163D55958114F8B75648" xlink:type="arc" />
    <link:label id="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_67DC6ADC8C54B08001AB8114F8B7576C_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_67DC6ADC8C54B08001AB8114F8B7576C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign Currency</link:label>
    <link:label id="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_67DC6ADC8C54B08001AB8114F8B7576C_label_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_67DC6ADC8C54B08001AB8114F8B7576C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign Currency Transactions and Translations Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:label="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_67DC6ADC8C54B08001AB8114F8B7576C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_67DC6ADC8C54B08001AB8114F8B7576C" xlink:to="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_67DC6ADC8C54B08001AB8114F8B7576C" xlink:type="arc" />
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    <link:label id="lab_mmsi_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax_DCD2FC6399039F30E5E38114F88E786D_negatedTerseLabel_en-US" xlink:label="lab_mmsi_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax_DCD2FC6399039F30E5E38114F88E786D" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Accumulated other comprehensive income (loss), interest rate swap, tax benefit</link:label>
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    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax" xlink:label="loc_mmsi_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax_DCD2FC6399039F30E5E38114F88E786D" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_FC9465F14995AF283C618114F88E204C" xlink:type="locator" />
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    <link:label id="lab_mmsi_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_3F23CDC0EB05842CAFE58114F88E2DD1_label_en-US" xlink:label="lab_mmsi_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_3F23CDC0EB05842CAFE58114F88E2DD1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax</link:label>
    <link:label id="lab_mmsi_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_3F23CDC0EB05842CAFE58114F88E2DD1_documentation_en-US" xlink:label="lab_mmsi_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_3F23CDC0EB05842CAFE58114F88E2DD1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax" xlink:label="loc_mmsi_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_3F23CDC0EB05842CAFE58114F88E2DD1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentTable_EB4EBFE5ACC5C73DFF9C8105CAFEA37D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_EB4EBFE5ACC5C73DFF9C8105CAFEA37D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Long-term Debt Instruments [Table]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentTable_EB4EBFE5ACC5C73DFF9C8105CAFEA37D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_EB4EBFE5ACC5C73DFF9C8105CAFEA37D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Long-term Debt Instruments [Table]</link:label>
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    <link:label id="lab_mmsi_DebtCovenantPeriodAxis_8C335628818BA674C89E8105CAFEE256_terseLabel_en-US" xlink:label="lab_mmsi_DebtCovenantPeriodAxis_8C335628818BA674C89E8105CAFEE256" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Covenant Period [Axis]</link:label>
    <link:label id="lab_mmsi_DebtCovenantPeriodAxis_8C335628818BA674C89E8105CAFEE256_label_en-US" xlink:label="lab_mmsi_DebtCovenantPeriodAxis_8C335628818BA674C89E8105CAFEE256" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Covenant Period [Axis]</link:label>
    <link:label id="lab_mmsi_DebtCovenantPeriodAxis_8C335628818BA674C89E8105CAFEE256_documentation_en-US" xlink:label="lab_mmsi_DebtCovenantPeriodAxis_8C335628818BA674C89E8105CAFEE256" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Covenant Period [Axis]</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_DebtCovenantPeriodAxis" xlink:label="loc_mmsi_DebtCovenantPeriodAxis_8C335628818BA674C89E8105CAFEE256" xlink:type="locator" />
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    <link:label id="lab_mmsi_DebtCovenantPeriodDomain_69D9F6CF3C1DCF093CAB8105CAFE9F43_label_en-US" xlink:label="lab_mmsi_DebtCovenantPeriodDomain_69D9F6CF3C1DCF093CAB8105CAFE9F43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Covenant Period [Domain]</link:label>
    <link:label id="lab_mmsi_DebtCovenantPeriodDomain_69D9F6CF3C1DCF093CAB8105CAFE9F43_documentation_en-US" xlink:label="lab_mmsi_DebtCovenantPeriodDomain_69D9F6CF3C1DCF093CAB8105CAFE9F43" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Domain] for Debt Covenant Period [Axis]</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_DebtCovenantPeriodDomain" xlink:label="loc_mmsi_DebtCovenantPeriodDomain_69D9F6CF3C1DCF093CAB8105CAFE9F43" xlink:type="locator" />
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    <link:label id="lab_mmsi_ThroughMarch312017Member_D7A7D4828E46D6B2A1EC8105CAFEDF11_terseLabel_en-US" xlink:label="lab_mmsi_ThroughMarch312017Member_D7A7D4828E46D6B2A1EC8105CAFEDF11" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Through March 31, 2017 [Member]</link:label>
    <link:label id="lab_mmsi_ThroughMarch312017Member_D7A7D4828E46D6B2A1EC8105CAFEDF11_label_en-US" xlink:label="lab_mmsi_ThroughMarch312017Member_D7A7D4828E46D6B2A1EC8105CAFEDF11" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Through March 31, 2017 [Member]</link:label>
    <link:label id="lab_mmsi_ThroughMarch312017Member_D7A7D4828E46D6B2A1EC8105CAFEDF11_documentation_en-US" xlink:label="lab_mmsi_ThroughMarch312017Member_D7A7D4828E46D6B2A1EC8105CAFEDF11" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Through March 31, 2017 [Member]</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_ThroughMarch312017Member" xlink:label="loc_mmsi_ThroughMarch312017Member_D7A7D4828E46D6B2A1EC8105CAFEDF11" xlink:type="locator" />
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    <link:label id="lab_mmsi_April12017throughJune302017Member_E88941A8E07335FBB8C48105CAFED2E6_label_en-US" xlink:label="lab_mmsi_April12017throughJune302017Member_E88941A8E07335FBB8C48105CAFED2E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">April 1, 2017 through June 30, 2017 [Member]</link:label>
    <link:label id="lab_mmsi_April12017throughJune302017Member_E88941A8E07335FBB8C48105CAFED2E6_documentation_en-US" xlink:label="lab_mmsi_April12017throughJune302017Member_E88941A8E07335FBB8C48105CAFED2E6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">April 1, 2017 through June 30, 2017 [Member]</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_April12017throughJune302017Member" xlink:label="loc_mmsi_April12017throughJune302017Member_E88941A8E07335FBB8C48105CAFED2E6" xlink:type="locator" />
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    <link:label id="lab_mmsi_July12017throughDecember312017Member_6E182D39A9E753184E438105CAFE055C_terseLabel_en-US" xlink:label="lab_mmsi_July12017throughDecember312017Member_6E182D39A9E753184E438105CAFE055C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">July 1, 2017 through December 31, 2017 [Member]</link:label>
    <link:label id="lab_mmsi_July12017throughDecember312017Member_6E182D39A9E753184E438105CAFE055C_label_en-US" xlink:label="lab_mmsi_July12017throughDecember312017Member_6E182D39A9E753184E438105CAFE055C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">July 1, 2017 through December 31, 2017 [Member]</link:label>
    <link:label id="lab_mmsi_July12017throughDecember312017Member_6E182D39A9E753184E438105CAFE055C_documentation_en-US" xlink:label="lab_mmsi_July12017throughDecember312017Member_6E182D39A9E753184E438105CAFE055C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">July 1, 2017 through December 31, 2017 [Member]</link:label>
    <link:loc xlink:href="mmsi-20161231.xsd#mmsi_July12017throughDecember312017Member" xlink:label="loc_mmsi_July12017throughDecember312017Member_6E182D39A9E753184E438105CAFE055C" xlink:type="locator" />
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    <link:label id="lab_mmsi_January12018throughMarch312018Member_72BBD0C177788AAF8C298105CAFF5C97_terseLabel_en-US" xlink:label="lab_mmsi_January12018throughMarch312018Member_72BBD0C177788AAF8C298105CAFF5C97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">January 1, 2018 through March 31, 2018 [Member]</link:label>
    <link:label id="lab_mmsi_January12018throughMarch312018Member_72BBD0C177788AAF8C298105CAFF5C97_label_en-US" xlink:label="lab_mmsi_January12018throughMarch312018Member_72BBD0C177788AAF8C298105CAFF5C97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">January 1, 2018 through March 31, 2018 [Member]</link:label>
    <link:label id="lab_mmsi_January12018throughMarch312018Member_72BBD0C177788AAF8C298105CAFF5C97_documentation_en-US" xlink:label="lab_mmsi_January12018throughMarch312018Member_72BBD0C177788AAF8C298105CAFF5C97" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">January 1, 2018 through March 31, 2018 [Member]</link:label>
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    <link:label id="lab_mmsi_April12018andthereafterMember_7766C0219AD71216E53F8105CAFF0318_terseLabel_en-US" xlink:label="lab_mmsi_April12018andthereafterMember_7766C0219AD71216E53F8105CAFF0318" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">April 1, 2018 and thereafter [Member]</link:label>
    <link:label id="lab_mmsi_April12018andthereafterMember_7766C0219AD71216E53F8105CAFF0318_label_en-US" xlink:label="lab_mmsi_April12018andthereafterMember_7766C0219AD71216E53F8105CAFF0318" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">April 1, 2018 and thereafter [Member]</link:label>
    <link:label id="lab_mmsi_April12018andthereafterMember_7766C0219AD71216E53F8105CAFF0318_documentation_en-US" xlink:label="lab_mmsi_April12018andthereafterMember_7766C0219AD71216E53F8105CAFF0318" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">April 1, 2018 and thereafter [Member]</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentAxis_38B667677225B9A1339E8105CAFF645A_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_38B667677225B9A1339E8105CAFF645A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_38B667677225B9A1339E8105CAFF645A_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_38B667677225B9A1339E8105CAFF645A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_CA31FF91085D998D24E0D27CC94493C6_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_CA31FF91085D998D24E0D27CC94493C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2016</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_CEBEA5F5858ADE73D297D27CC9441F29" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_E2139704551B6D48836AD27CC94499ED_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_E2139704551B6D48836AD27CC94499ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_A52648D5FA149A5DD38CD27CC9444D25_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_A52648D5FA149A5DD38CD27CC9444D25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
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    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_EA79CBF4D75D15D54ED48A81EE229B96_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_EA79CBF4D75D15D54ED48A81EE229B96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BC1F1664C87EC1746D5C8A81EE27B981_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BC1F1664C87EC1746D5C8A81EE27B981" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BC1F1664C87EC1746D5C8A81EE27B981" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BC1F1664C87EC1746D5C8A81EE27B981" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_BC1F1664C87EC1746D5C8A81EE27B981" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B6787F0455683F465E6B8A81EE28BC3E_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B6787F0455683F465E6B8A81EE28BC3E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income to net cash provided by operating activities:</link:label>
    <link:label id="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B6787F0455683F465E6B8A81EE28BC3E_label_en-US" xlink:label="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B6787F0455683F465E6B8A81EE28BC3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
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    <link:label id="lab_mmsi_LossOnSaleAndOrAbandonmentOfPropertyAndEquipment_A80F6D14780657C3C6EC8A81EE2986CB_terseLabel_en-US" xlink:label="lab_mmsi_LossOnSaleAndOrAbandonmentOfPropertyAndEquipment_A80F6D14780657C3C6EC8A81EE2986CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Losses (gains) on sales and/or abandonment of property and equipment</link:label>
    <link:label id="lab_mmsi_LossOnSaleAndOrAbandonmentOfPropertyAndEquipment_A80F6D14780657C3C6EC8A81EE2986CB_label_en-US" xlink:label="lab_mmsi_LossOnSaleAndOrAbandonmentOfPropertyAndEquipment_A80F6D14780657C3C6EC8A81EE2986CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss On Sale And Or Abandonment Of Property And Equipment</link:label>
    <link:label id="lab_mmsi_LossOnSaleAndOrAbandonmentOfPropertyAndEquipment_A80F6D14780657C3C6EC8A81EE2986CB_documentation_en-US" xlink:label="lab_mmsi_LossOnSaleAndOrAbandonmentOfPropertyAndEquipment_A80F6D14780657C3C6EC8A81EE2986CB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The losses included in results of operations resulting from the sale of property and equipment. Also includes the expense charged against earnings to eliminate property and equipment abandoned during the reporting period. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.</link:label>
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    <link:label id="lab_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_D7BA651484CB3635E10D8A81EE298DCA_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_D7BA651484CB3635E10D8A81EE298DCA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Write-off of patents and intangible assets</link:label>
    <link:label id="lab_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_D7BA651484CB3635E10D8A81EE298DCA_label_en-US" xlink:label="lab_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_D7BA651484CB3635E10D8A81EE298DCA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impairment of Intangible Assets, Finite-lived</link:label>
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    <link:label id="lab_us-gaap_OtherAmortizationOfDeferredCharges_8C71CDBF70CB0CD61E1C8A81EE2A306A_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAmortizationOfDeferredCharges_8C71CDBF70CB0CD61E1C8A81EE2A306A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of deferred credits</link:label>
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    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_13BA04AD790B62E5275A8A81EE2A5835_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_13BA04AD790B62E5275A8A81EE2A5835" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_437DAF1BCBF92DC8E6368A81EE3424B9_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_437DAF1BCBF92DC8E6368A81EE3424B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other long-term obligations</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_437DAF1BCBF92DC8E6368A81EE3424B9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64E7F6A6FB05ECED00448A81EE345EDF_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64E7F6A6FB05ECED00448A81EE345EDF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64E7F6A6FB05ECED00448A81EE345EDF_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64E7F6A6FB05ECED00448A81EE345EDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_64E7F6A6FB05ECED00448A81EE345EDF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_64E7F6A6FB05ECED00448A81EE345EDF" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64E7F6A6FB05ECED00448A81EE345EDF" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_2A32EC9F86CACB4B63318A81EE3ACB15_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_2A32EC9F86CACB4B63318A81EE3ACB15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CASH FLOWS FROM INVESTING ACTIVITIES:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_2A32EC9F86CACB4B63318A81EE3ACB15" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireProductiveAssetsAbstract_E317BD2A72C96916D3728A81EE3AEBC1_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireProductiveAssetsAbstract_E317BD2A72C96916D3728A81EE3AEBC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures for:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssetsAbstract" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssetsAbstract_E317BD2A72C96916D3728A81EE3AEBC1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_8551642B49C966A4C59A8A81EE3A526D_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_8551642B49C966A4C59A8A81EE3A526D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Property and equipment</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireIntangibleAssets_7F8A2834ADE9D80648D98A81EE3B5053_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireIntangibleAssets_7F8A2834ADE9D80648D98A81EE3B5053" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Intangible assets</link:label>
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    <link:label id="lab_us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities_0C9D713ACB39D47D174A8A81EE3B7C4B_terseLabel_en-US" xlink:label="lab_us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities_0C9D713ACB39D47D174A8A81EE3B7C4B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale-leaseback transactions</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_83D466DE72BAB2EE17B88A81EE3BFD1E_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_83D466DE72BAB2EE17B88A81EE3BFD1E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from the sale of property and equipment</link:label>
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    <link:label id="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_2E375480B7CD225C0FA58A81EE3D0BE9_terseLabel_en-US" xlink:label="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_2E375480B7CD225C0FA58A81EE3D0BE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Excess tax benefits from stock-based compensation</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_2E375480B7CD225C0FA58A81EE3D0BE9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_9BF78AE2A133DF08C4DD8A81EE3DBABF_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_9BF78AE2A133DF08C4DD8A81EE3DBABF" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Long-term debt issuance costs</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_9BF78AE2A133DF08C4DD8A81EE3DBABF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_6E5D9A36675869E267638A81EE42431D_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_6E5D9A36675869E267638A81EE42431D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contingent payments related to acquisitions</link:label>
    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_6E5D9A36675869E267638A81EE42431D_label_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_6E5D9A36675869E267638A81EE42431D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from (Payments for) Other Financing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_6E5D9A36675869E267638A81EE42431D" xlink:type="locator" />
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    <link:label id="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_4D2B3CD1A63A2DC18B9D8A81EE432C76_negatedLabel_en-US" xlink:label="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_4D2B3CD1A63A2DC18B9D8A81EE432C76" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Payment of taxes related to an exchange of common stock</link:label>
    <link:label id="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_4D2B3CD1A63A2DC18B9D8A81EE432C76_label_en-US" xlink:label="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_4D2B3CD1A63A2DC18B9D8A81EE432C76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment of Taxes Exchange of Common Stock</link:label>
    <link:label id="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_4D2B3CD1A63A2DC18B9D8A81EE432C76_documentation_en-US" xlink:label="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_4D2B3CD1A63A2DC18B9D8A81EE432C76" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the total of the cash outflow during the period for taxes related to an exchange of common stock.</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_2F88BBB2F0A2776C545C8A81EE43D76B_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_2F88BBB2F0A2776C545C8A81EE43D76B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by (used in) financing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_2F88BBB2F0A2776C545C8A81EE43D76B_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_2F88BBB2F0A2776C545C8A81EE43D76B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_2F88BBB2F0A2776C545C8A81EE43D76B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_0AC58FA8769F20EBC33E8A81EE44008D_terseLabel_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_0AC58FA8769F20EBC33E8A81EE44008D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EFFECT OF EXCHANGE RATES ON CASH</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_428D322EF78BCE4E6F698A81EE4451F2_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_428D322EF78BCE4E6F698A81EE4451F2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_428D322EF78BCE4E6F698A81EE4451F2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_8EB70FE05E989D5C8E578A81EE44AD3A_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_8EB70FE05E989D5C8E578A81EE44AD3A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION</link:label>
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    <link:label id="lab_us-gaap_InterestPaidNet_17B34013C0113C02BAF68A81EE459B79_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_17B34013C0113C02BAF68A81EE459B79" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest (net of capitalized interest of $460, $325 and $389, respectively)</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_368DDCC397F82275EF018105CC8CE538_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_368DDCC397F82275EF018105CC8CE538" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Property and equipment &#8212; net</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_368DDCC397F82275EF018105CC8CE538_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_368DDCC397F82275EF018105CC8CE538" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
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    <link:label id="lab_us-gaap_DeferredTaxAssetsNetNoncurrent_C5C48CCE13FE7B3C3CFA8105CC8C0395_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetNoncurrent_C5C48CCE13FE7B3C3CFA8105CC8C0395" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income tax assets</link:label>
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    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_2CCDD03FAF169775F0B88105CC8C41B0_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_2CCDD03FAF169775F0B88105CC8C41B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Noncurrent</link:label>
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    <link:label id="lab_mmsi_IntangibleAssetsNetGoodwillAndOtherAssetsNoncurrent_FE2A76875D6A6BD7B92C8105CC8C0555_totalLabel_en-US" xlink:label="lab_mmsi_IntangibleAssetsNetGoodwillAndOtherAssetsNoncurrent_FE2A76875D6A6BD7B92C8105CC8C0555" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total other assets</link:label>
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    <link:label id="lab_us-gaap_Assets_E605A050119677C641408105CC8D82AD_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_E605A050119677C641408105CC8D82AD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">TOTAL</link:label>
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