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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
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      <FSAuditedInd>true</FSAuditedInd>
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      <AuditCommitteeInd>true</AuditCommitteeInd>
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    </IRS990>
    <IRS990ScheduleC documentId="IRS990ScheduleC">
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      <TotalDirectLobbyingGrp />
      <TotalLobbyingExpendGrp />
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      <TotalExemptPurposeExpendGrp />
      <LobbyingNontaxableAmountGrp />
      <GrassrootsNontaxableGrp />
      <TotLbbyngGrassrootMnsNonTxGrp />
      <TotLbbyExpendMnsLbbyngNonTxGrp />
      <SubstantiallyAllDuesNondedInd>false</SubstantiallyAllDuesNondedInd>
      <OnlyInHouseLobbyingInd>true</OnlyInHouseLobbyingInd>
      <AgreeCarryoverPriorYearInd>false</AgreeCarryoverPriorYearInd>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="IRS990ScheduleD">
      <ArtPublicExhibitionAmountsGrp />
      <HeldWorksArtGrp />
      <CYMinus3YrEndwmtFundGrp />
      <CYMinus4YrEndwmtFundGrp />
      <LandGrp />
      <BuildingsGrp />
      <LeaseholdImprovementsGrp />
      <EquipmentGrp />
      <OtherLandBuildingsGrp />
      <FederalIncomeTaxLiabilityAmt>0</FederalIncomeTaxLiabilityAmt>
      <TotalLiabilityAmt>0</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>908943</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>71569</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>71569</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>837374</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>12322</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>12322</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>849696</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>689308</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>689308</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>12322</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>12322</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>701630</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PART X, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ASSOCIATION QUALIFIES AS AN EXEMPT ORGANIZATION UNDER SECTION 501(C)(6) OF THE INTERNAL REVENUE CODE AND A SIMILAR PROVISION OF STATE LAW. THE ASSOCIATION IS SUBJECT TO FEDERAL INCOME TAX ON ANY UNRELATED BUSINESS TAXABLE INCOME AND RECOGNIZES THE FINANCIAL STATEMENT IMPACT OF A TAX POSITION WHEN IT IS MORE LIKELY THAN NOT THE POSITION WILL BE SUSTAINED UPON EXAMINATION.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="IRS990ScheduleI">
      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>The Thoracic Surgery Foundation</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>633 North St Clair Suite 2100</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60611</ZIPCd>
        </USAddress>
        <RecipientEIN>363635910</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>60000</CashGrantAmt>
        <PurposeOfGrantTxt>Research</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>1</Total501c3OrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Scholarships</GrantTypeTxt>
        <RecipientCnt>8</RecipientCnt>
        <CashGrantAmt>10915</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>STSA leadership approves the grants during their board meetings. The TSF/STSA Resident Research Award funded by STSA was originally presented in a formal request (letter) addressed to a past STSA President which is then presented to STSA leadership at one of their board meetings. Leadership votes to approve or not approve the request for funding. TSF is currently the only organization that STSA supports in the form of a grant and this award goes back a couple of years.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>PER A MANAGEMENT AGREEMENT BETWEEN BOTH PARTIES, STSA HAS RETAINED THE SOCIETY OF THORACIC SURGEONS (STS) TO PROVIDE ADMINISTRATIVE MANAGEMENT SERVICES AND TO PERFORM SUCH OTHER DUTIES AND SERVICES AS MAY BE ENTRUSTED TO STS BY STSA IN ACCORDANCE WITH STSA'S BYLAWS, ARTICLES OF INCORPORATION, RULES AND REGULATIONS AND BUDGET. THE STS OFFICE SERVES AS THE HEADQUARTERS FOR STSA. THE EMPLOYEES OF STS PROVIDE THESE SERVICES AND TOTAL FEES PAID TO STS ARE $190,000.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BYLAWS WERE AMENDED TO CHANGE THE DESCRIPTION OF THE EXECTIVE COMMITTEE. THE UPDATED DESCRIPTION IS: The Executive Committee of the Association shall consist of the Council Chair, President, Vice President/President-Elect, Secretary/Treasurer and the Executive Director. The Executive Director shall be ex-officio, a member of the Executive Committee without the right to vote. The Vice President/President-Elect shall serve as Chair of the Executive Committee. During the intervals between meetings of the Council, the Executive Committee shall possess and may exercise all the powers of the Council in the management and direction of the affairs of the Society, except with respect to authority prohibited, prescribed or limited by resolution of the Council. A majority of the members of the Executive Committee shall constitute a quorum for meetings and, unless otherwise provided under these Bylaws or by law, the act of a majority of the members of the Executive Committee shall constitute the act of the Executive Committee. Meetings may be called by the President or any two Executive Committee members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ASSOCIATION HAS MEMBERS. THERE ARE SIX (6) CATEGORIES OF MEMBERS: ACTIVE, SENIOR, CANDIDATE, PRE-CANDIDATE, ASSOCIATE, AND HONORARY MEMBER. MEMBERS SHALL BE INDIVIDUALS WHO SUPPORT THE PURPOSE OF THE ASSOCIATION AND WHO AGREE TO COMPLY WITH THE ASSOCIATION'S RULES AND REGULATIONS. ACTIVE AND SENIOR MEMBERS SHALL BE ENTITLED TO HOLD OFFICE AND SHALL HAVE VOTING PRIVILEGES. ACTIVE AND SENIOR MEMBERS MUST BE BOARD CERTIFIED BY THE AMERICAN BOARD OF THORACIC SURGERY OR ITS FOREIGN EQUIVALENT. ASSOCIATE MEMBERS INCLUDE SUPPORT STAFF FOR PRACTICING CARDIOTHORACIC SURGEONS INCLUDING, BUT NOT LIMITED TO, NURSES, NURSE PRACTITIONERS, PERFUSIONISTS, PHYSICIAN ASSISTANTS, AND RESEARCH STAFF. HONORARY MEMBERSHIP CAN BE BESTOWED UPON A WORTHY RECIPIENT UPON RECOMMENDATION OF THE COUNCIL AND RATIFICATION BY A TWO-THIRDS MAJORITY OF THE VOTES AT THE ANNUAL MEETING. HONORARY MEMBERS ARE WELCOMED AT ALL SCIENTIFIC AND BUSINESS MEETINGS OF THE ASSOCIATION, BUT HAVE NO OBLIGATIONS OR RESPONSIBILITIES IN THE ORGANIZATION. CANDIDATE MEMBERS MUST BE MATCHED OR ENROLLED IN A THORACIC SURGERY EDUCATIONAL PROGRAM ACCREDITED BY THE RESIDENCY REVIEW COMMITTEE FOR THORACIC SURGERY UNDER THE AUTHORITY OF THE ACCREDITATION COUNCIL FOR GRADUATE MEDICAL EDUCATION THAT IS WITHIN THE STSA REGION PROVIDED FOR IN THE BYLAWS TO BE CLASSIFIED AS A CANDIDATE MEMBER. PRE-CANDIDATE MEMBERS MAY APPLY FOR MEMBERSHIP BY EXPRESSING A DESIRE TO ENTER THE FIELD OF CARDIOTHORACIC SURGERY. PRE-CANDIDATE MEMBERS MAY TRANSFER TO CANDIDATE MEMBER STATUS ONCE THEY HAVE MATCHED OR ENROLLED IN A THORACIC SURGERY EDUCATIONAL PROGRAM ACCREDITED BY THE RESIDENCY REVIEW COMMITTEE FOR THORACIC SURGERY UNDER THE AUTHORITY OF THE ACCREDITATION COUNCIL FOR GRADUATE MEDICAL EDUCATION THAT IS WITHIN THE STSA REGION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS PARTICIPATE IN THE ELECTION OF OFFICERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBERS CAN VOTE ON BYLAW CHANGES, APPROVE NEW MEMBERS AND THE SLATE OF NOMINATIONS FOR OFFICERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION RETAINED THE SERVICES OF AN INDEPENDENT CPA FIRM TO PREPARE ITS FORM 990. MANAGEMENT THEN REVIEWED THE COMPLETED FORM 990 AND PROVIDED A FULL COPY TO ALL VOTING MEMBERS OF THE ORGANIZATION'S EXECUTIVE COUNCIL (IE, THE GOVERNING BODY). THE VOTING MEMBERS OF THE GOVERNING BODY WERE GIVEN A REASONABLE AMOUNT OF TIME TO REVIEW THE RETURN AND ASK ANY QUESTIONS DIRECTLY TO MANAGEMENT OR CORPORATE OFFICERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>OFFICERS, COUNCILORS, AND OTHERS ARE ANNUALLY REQUIRED TO COMPLETE A CONFLICT OF INTEREST DISCLOSURE STATEMENT AS A REQUIREMENT OF SERVICE. THE STATEMENT ON STSA DISCLOSURE POLICY AND GUIDELINES REGARDING CONFLICTS OF INTEREST IS READ AT THE BEGINNING OF EVERY EXECUTIVE COUNCIL, COMMITTEE, COUNCIL OPERATING BOARD, AND WORKFORCE MEETING. IF A CONFLICT OF INTEREST OR THE APPEARANCE OF A CONFLICT OF INTEREST EXISTS, THE PERSON WITH SUCH A CONFLICT MUST DISCLOSE THE RELATIONSHIP AND REFRAIN FROM VOTING ON THE MATTER. IF THE NATURE OF THE RELATIONSHIP SUGGESTS THAT HIS OR HER PRESENCE MAY BE DETRIMENTAL TO THE DISCUSSION, HE OR SHE MUST EXIT THE MEETING. THE MEETING CHAIR MAKES THE FINAL DETERMINATIONS TO THE APPROPRIATE ACTION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>AVAILABLE UPON REQUEST</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>