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        <TotalRevenueColumnAmt>2957267</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2957267</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>PUBLICATIONS</Desc>
        <BusinessCd>511120</BusinessCd>
        <TotalRevenueColumnAmt>805423</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>797516</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>7907</UnrelatedBusinessRevenueAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>3762690</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>376978</TotalRevenueColumnAmt>
        <ExclusionAmt>376978</ExclusionAmt>
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      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>724595</SecuritiesAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>693054</SecuritiesAmt>
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      <GainOrLossGrp>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>31541</TotalRevenueColumnAmt>
        <ExclusionAmt>31541</ExclusionAmt>
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      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>5740892</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>3754783</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>7907</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>408519</ExclusionAmt>
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      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>40000</ProgramServicesAmt>
      </GrantsToDomesticIndividualsGrp>
      <CompCurrentOfcrDirectorsGrp>
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        <ProgramServicesAmt>62100</ProgramServicesAmt>
        <ManagementAndGeneralAmt>199240</ManagementAndGeneralAmt>
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      <OtherSalariesAndWagesGrp>
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        <ProgramServicesAmt>170983</ProgramServicesAmt>
        <ManagementAndGeneralAmt>289183</ManagementAndGeneralAmt>
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      <PensionPlanContributionsGrp>
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        <ManagementAndGeneralAmt>9451</ManagementAndGeneralAmt>
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      <OtherEmployeeBenefitsGrp>
        <TotalAmt>26212</TotalAmt>
        <ManagementAndGeneralAmt>26212</ManagementAndGeneralAmt>
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      <PayrollTaxesGrp>
        <TotalAmt>39181</TotalAmt>
        <ManagementAndGeneralAmt>39181</ManagementAndGeneralAmt>
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      <FeesForServicesManagementGrp>
        <TotalAmt>252547</TotalAmt>
        <ProgramServicesAmt>207132</ProgramServicesAmt>
        <ManagementAndGeneralAmt>45415</ManagementAndGeneralAmt>
      </FeesForServicesManagementGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>12823</TotalAmt>
        <ManagementAndGeneralAmt>12823</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>23800</TotalAmt>
        <ManagementAndGeneralAmt>23800</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>264298</TotalAmt>
        <ProgramServicesAmt>30236</ProgramServicesAmt>
        <ManagementAndGeneralAmt>234062</ManagementAndGeneralAmt>
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      <AdvertisingGrp>
        <TotalAmt>335124</TotalAmt>
        <ProgramServicesAmt>156655</ProgramServicesAmt>
        <ManagementAndGeneralAmt>178469</ManagementAndGeneralAmt>
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      <OfficeExpensesGrp>
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        <ProgramServicesAmt>69403</ProgramServicesAmt>
        <ManagementAndGeneralAmt>31687</ManagementAndGeneralAmt>
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      <OccupancyGrp>
        <TotalAmt>59686</TotalAmt>
        <ManagementAndGeneralAmt>59686</ManagementAndGeneralAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>1056381</TotalAmt>
        <ProgramServicesAmt>923745</ProgramServicesAmt>
        <ManagementAndGeneralAmt>132636</ManagementAndGeneralAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>954698</TotalAmt>
        <ProgramServicesAmt>987669</ProgramServicesAmt>
        <ManagementAndGeneralAmt>-32971</ManagementAndGeneralAmt>
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      <DepreciationDepletionGrp>
        <TotalAmt>7988</TotalAmt>
        <ManagementAndGeneralAmt>7988</ManagementAndGeneralAmt>
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      <InsuranceGrp>
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        <ManagementAndGeneralAmt>11938</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>NEWSLETTER AND PUBLICAT</Desc>
        <TotalAmt>479299</TotalAmt>
        <ProgramServicesAmt>420596</ProgramServicesAmt>
        <ManagementAndGeneralAmt>58703</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>PRESIDENT HONORARIUM</Desc>
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        <ManagementAndGeneralAmt>40000</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>OTHER</Desc>
        <TotalAmt>17562</TotalAmt>
        <ProgramServicesAmt>2248</ProgramServicesAmt>
        <ManagementAndGeneralAmt>15314</ManagementAndGeneralAmt>
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      <TotalFunctionalExpensesGrp>
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        <ManagementAndGeneralAmt>1382817</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <CashNonInterestBearingGrp>
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      <SavingsAndTempCashInvstGrp>
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        <EOYAmt>547546</EOYAmt>
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      <AccountsReceivableGrp>
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        <EOYAmt>389248</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
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        <EOYAmt>161952</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>60727</LandBldgEquipCostOrOtherBssAmt>
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        <EOYAmt>176341</EOYAmt>
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      <DeferredRevenueGrp>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>1069849</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
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        <EOYAmt>13446605</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>10713317</BOYAmt>
        <EOYAmt>13446605</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>12170589</BOYAmt>
        <EOYAmt>14516454</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>1287308</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>1494493</NetUnrlzdGainsLossesInvstAmt>
      <InvestmentExpenseAmt>-48513</InvestmentExpenseAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContrisRcvd509Grp>
        <CurrentTaxYearMinus4YearsAmt>1312290</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1336464</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1657407</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>2102167</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1569683</CurrentTaxYearAmt>
        <TotalAmt>7978011</TotalAmt>
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      <GrossReceiptsAdmissionsGrp>
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        <CurrentTaxYearMinus3YearsAmt>2295574</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2887497</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>4046091</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>3762690</CurrentTaxYearAmt>
        <TotalAmt>15456842</TotalAmt>
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      <Total509Grp>
        <CurrentTaxYearMinus4YearsAmt>3777280</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>3632038</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4544904</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>6148258</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5332373</CurrentTaxYearAmt>
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      <AmountsRcvdDsqlfyPersonGrp>
        <TotalAmt>0</TotalAmt>
      </AmountsRcvdDsqlfyPersonGrp>
      <SubstantialContributorsAmtGrp>
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        <CurrentTaxYearMinus3YearsAmt>44898</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>92301</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>189076</CurrentTaxYearMinus1YearAmt>
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      </SubstantialContributorsAmtGrp>
      <SubstAndDsqlfyPrsnsTotGrp>
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        <CurrentTaxYearMinus2YearsAmt>92301</CurrentTaxYearMinus2YearsAmt>
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      <GrossInvestmentIncome509Grp>
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        <CurrentTaxYearMinus2YearsAmt>378384</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>499886</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>408519</CurrentTaxYearAmt>
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      </GrossInvestmentIncome509Grp>
      <InvestmentIncomeAndUBTIGrp>
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        <CurrentTaxYearMinus3YearsAmt>273095</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>378384</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>499886</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>408519</CurrentTaxYearAmt>
        <TotalAmt>1838754</TotalAmt>
      </InvestmentIncomeAndUBTIGrp>
      <TotalSupportCalendarYearGrp>
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        <CurrentTaxYearMinus3YearsAmt>3905133</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4923288</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>6648144</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5740892</CurrentTaxYearAmt>
        <TotalAmt>25273607</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.91080</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.90800</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.07280</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.07340</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>60727</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>16592</DepreciationAmt>
        <BookValueAmt>44135</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>44135</TotalBookValueLandBuildingsAmt>
      <TotalRevEtcAuditedFinclStmtAmt>7186872</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>1494493</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>1494493</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>5692379</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>48513</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>48513</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>5740892</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>4453584</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>4453584</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>4453584</TotalExpensesPerForm990Amt>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>0</GrantRecordsMaintainedInd>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>GRANTS TO FUND RESEARCH IN THE PRACTICE OF REGIONAL ANESTHESIA AND PAIN MEDICINE.</GrantTypeTxt>
        <RecipientCnt>2</RecipientCnt>
        <CashGrantAmt>40000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ANGELA STENGELCAE</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>195333</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>3907</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>199240</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION STUDIES REVIEWED INCLUDE THE AAMSE (AMERICAN ASSOCIATION OF MEDICAL SOCIETIES EXECUTIVES) STUDY (2017) AND THE ASAE AND CENTER FOR ASSOCIATION LEADERSHIP COMPENSATION STUDY (2017).</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <DrugsAndMedicalSuppliesGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>6</ContributionCnt>
        <NoncashContributionsRptF990Amt>34044</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FAIR VALUE</MethodOfDeterminingRevenuesTxt>
      </DrugsAndMedicalSuppliesGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>0</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FINANCE COMMITTEE AND BOARD OF DIRECTORS REVIEW A DRAFT OF IRS FORM 990 BEFORE IT IS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ON AN ANNUAL BASIS, THE ORGANIZATION'S BOARD MEMBERS AND OFFICERS ARE REQUIRED TO DISCLOSE ON A DISCLOSURE FORM ANY POTENTIAL CONFLICTS OF INTEREST AND, IF SO, ARE REQUIRED TO DESCRIBE THEM. BOARD MEMBERS ARE REQUIRED TO ABSTAIN FROM VOTING ON ANY ISSUES WHERE THEY HAVE A POTENTIAL CONFLICT. THE ADMINISTRATIVE OFFICE MAINTAINS THE COMPLETED DISCLOSURE FORMS FOR THE ORGANIZATION AND POST THEM TO THE WEBSITE ONCE A YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION FOR THE ORGANIZATION'S KEY EMPLOYEES AND EXECUTIVE DIRECTOR IS DETERMINED BY THE BOARD OF DIRECTORS BASED ON INFORMATION OBTAINED FROM VARIOUS APPLICABLE EMPLOYMENT SURVEYS AND HUMAN RESOURCE SERVICES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES A COPY OF ITS IRS FORM 990 AVAILABLE UPON REQUEST</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>