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        <PersonNm>Marc Ruel</PersonNm>
        <TitleTxt>Canadian Director</TitleTxt>
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        <PersonNm>Patrick O Myers</PersonNm>
        <TitleTxt>International Director</TitleTxt>
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        <PersonNm>Sandra L Starnes</PersonNm>
        <TitleTxt>Director-At-Large - STARTED 01/2024</TitleTxt>
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        <PersonNm>Stephanie M Fuller</PersonNm>
        <TitleTxt>Director-At-Large</TitleTxt>
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        <PersonNm>Thomas G Gleason</PersonNm>
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        <PersonNm>Vinay Badhwar</PersonNm>
        <TitleTxt>Second Vice President</TitleTxt>
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        <PersonNm>Elaine Weiss</PersonNm>
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        <PersonNm>Avidan Stern</PersonNm>
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        <PersonNm>Charlie Simpson</PersonNm>
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        <PersonNm>Derek Brandt</PersonNm>
        <TitleTxt>Vice President Government Relations</TitleTxt>
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        <PersonNm>Grahame Rush</PersonNm>
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        <PersonNm>Jane Han</PersonNm>
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        <PersonNm>Keith Bura</PersonNm>
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        <PersonNm>Robert Habib</PersonNm>
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        <PersonNm>Scott Bradbury</PersonNm>
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        <PersonNm>William Seward</PersonNm>
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        <PersonNm>Colleen Donohoe</PersonNm>
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        <PersonNm>Haris Subacius</PersonNm>
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        <PersonNm>Jane Han</PersonNm>
        <TitleTxt>Vice President, Quality And Research</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Grahame Rush</PersonNm>
        <TitleTxt>Senior Vice President</TitleTxt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>William Seward</PersonNm>
        <TitleTxt>Senior Vice President</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Charlie Simpson</PersonNm>
        <TitleTxt>Senior Vice President Marketing &amp; Communication</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Avidan Stern</PersonNm>
        <TitleTxt>General Counsel</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>30962</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>354499</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Kathryn Cummings</PersonNm>
        <TitleTxt>Director Of Communications</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Colleen Donohoe</PersonNm>
        <TitleTxt>Vice President, Meetings And Conventions</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Kevin Gilmartin</PersonNm>
        <TitleTxt>Director Of Information Technology</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <PersonNm>Haris Subacius</PersonNm>
        <TitleTxt>Associate Director, Database Analytics</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Lee A Wiensch</PersonNm>
        <TitleTxt>TSF Executive Director</TitleTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4b Supplemental nonqualified retirement plan</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY OF THORACIC SURGEONS HAS ESTABLISHED A NON-QUALIFIED SECTION 457(F) DEFERRED COMPENSATION PLAN. THE SOCIETY CREDITS PARTICIPANTS ACCOUNTS WHICH ARE RECORDED ON FORM 990 AS DEFERRED COMPENSATION. THESE BALANCES VEST OVER A THREE-YEAR PERIOD. PARTICIPANT BALANCES ARE SUBJECT TO FORFEITURE PRIOR TO VESTING. THE PLAN CONTRIBUTIONS ARE HELD IN A RABBI TRUST AND REMAIN THE ASSET OF THE ORGANIZATION AND ARE SUBJECT TO THE CLAIMS OF THE ORGANIZATION'S GENERAL CREDITORS UNTIL SUCH AMOUNTS ARE PAID OUT TO THE INDIVIDUAL. DURING THE YEAR, ELAINE WEISS PARTICIPATED IN A NON-QUALIFIED SECTION 457(F) DEFERRED COMPENSATION PLAN. A DISTRIBUTION OF $29,376 WAS MADE FROM THE PLAN IN 2024.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>AS INDICATED IN SCHEDULE J, PART II, CEO/EXECUTIVE DIRECTOR, KEY EMPLOYEES AND HIGHLY COMPENSATED EMPLOYEES OF THE ORGANIZATION ARE ELIGIBLE TO RECEIVE A BONUS BASED ON PERFORMANCE METRICS AND THE FINANCIAL RESULTS OF THE ORGANIZATION. THIS BONUS WAS APPROVED BY BOARD OF DIRECTORS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Line 4 Significant changes to organizational documents</FormAndLineReferenceDesc>
        <ExplanationTxt>THE STS BYLAWS APPENDIX WAS UPDATED TO CLARIFY WORKFORCE RESPONSIBILITIES, STANDARDIZE NUMBERING, AND ADD NEW WORKFORCES UNDER THE COUNCIL ON EDUCATION, INCLUDING CRITICAL CARE, E-LEARNING AND EDUCATIONAL INNOVATION, INTERNATIONAL EDUCATION, SURGICAL TREATMENT OF ADULTS WITH CONGENITAL HEART DISEASE, END-STAGE CARDIOPULMONARY DISEASE, AND TECHNOLOGY AND INNOVATION. SECTION 4, NOMINATING COMMITTEE: THE NOMINATING COMMITTEE WAS EXPANDED TO INCLUDE FOUR ADDITIONAL APPOINTED MEMBERS FROM THE SOCIETY'S COUNCILS, WITH DEFINED TERMS AND VACANCY PROCEDURES. A NEW RESTRICTION WAS ADDED PROHIBITING COMMITTEE MEMBERS FROM BEING NOMINATED FOR ELECTIONS TO OFFICE OR THE BOARD. SECTION 8 - VACANCIES: ADDED LANGUAGE CLARIFYING THAT THE PRESIDENT'S AUTHORITY TO FILL COMMITTEE VACANCIES, WITH EXECUTIVE COMMITTEE APPROVAL, APPLIES EXCEPT WHERE OTHER BYLAW PROVISIONS SPECIFY A DIFFERENT PROCESS. THIS ENSURES ALIGNMENT WITH ANY EXCEPTIONS IN THE BYLAWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6 Classes of members or stockholders</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION IS A MEMBERSHIP SOCIETY AND HAS OVER 7,800 MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7a Members or stockholders electing members of governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS OF THE GOVERNING BODY ARE ELECTED BY THE MEMBERSHIP AT ITS ANNUAL MEETING PURSUANT TO THE ORGANIZATION'S BYLAWS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7b Decisions requiring approval by members or stockholders</FormAndLineReferenceDesc>
        <ExplanationTxt>CERTAIN DECISIONS OF THE GOVERNING BODY (E.G., BYLAWS AMENDMENTS) ARE SUBJECT TO APPROVAL BY MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</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 BOARD OF DIRECTORS (I.E., 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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>OFFICERS, DIRECTORS, KEY EMPLOYEES, AND OTHERS ARE ANNUALLY REQUIRED TO COMPLETE A CONFLICT OF INTEREST DISCLOSURE STATEMENT AS A REQUIREMENT OF SERVICE. THE STATEMENT ON STS DISCLOSURE POLICY AND GUIDELINES REGARDING CONFLICTS OF INTEREST IS READ AT THE BEGINNING OF EVERY BOARD OF DIRECTORS, 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 DETERMINATION AS TO THE APPROPRIATE ACTION.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a Process to establish compensation of top management official</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY ENGAGES AN INDEPENDENT COMPENSATION CONSULTANT ANNUALLY TO PERFORM A MARKET SALARY ANALYSIS FOR THE CEO/EXECUTIVE DIRECTOR POSITION. THIS INFORMATION IS SHARED WITH THE EXECUTIVE COMMITTEE WHICH DETERMINES THE NEW LEVEL OF COMPENSATION AND COMMUNICATES THE SALARY INFORMATION TO THE CEO/EXECUTIVE DIRECTOR AND TO THE VICE PRESIDENT OF FINANCE &amp; ADMINISTRATION FOR IMPLEMENTATION. AN ADJUSTMENT IS MADE TO THE CEO/EXECUTIVE DIRECTOR'S SALARY ANNUALLY FOR A MERIT INCREASE, WHICH IS BASED ON A FORMAL PERFORMANCE EVALUATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b Process to establish compensation of other employees</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY ENGAGES AN INDEPENDENT COMPENSATION CONSULTANT PERIODICALLY, USUALLY EVERY TWO OR THREE YEARS, TO PERFORM A MARKET SALARY ANALYSIS FOR STS POSITIONS. THE CONSULTANT MEETS WITH HUMAN RESOURCES TO ASCERTAIN INFORMATION RELEVANT TO EACH POSITION. THE CONSULTANT ALSO REVIEWS EACH OF THE POSITION DESCRIPTIONS, DETERMINES APPROPRIATE MATCHES FROM COMPENSATION MARKET SURVEYS, E.G., TOWERS WATSON, PRM, ASSOCIATION FORUM, AND ASAE, FOR COMPARABLE POSITIONS AT SIMILARLY SITUATED ORGANIZATIONS, AND COMPILES AND ANALYZES THIS MARKET DATA FOR EACH POSITION. THE CONSULTANT MEETS WITH THE CEO/EXECUTIVE DIRECTOR, VICE PRESIDENT OF FINANCE &amp; ADMINISTRATION AND ASSOCIATE DIRECTOR OF HUMAN RESOURCES TO REVIEW THE COMPENSATION ANALYSIS, AND MAKES ADJUSTMENTS TO THE ANALYSIS, AS APPROPRIATE. UTILIZING THE CONSULTANT'S ANALYSIS, THE CEO/EXECUTIVE DIRECTOR MAKES SALARY ADJUSTMENTS. AN INDEPENDENT COMPENSATION CONSULTANT WAS UTILIZED AS PART OF THIS PROCESS IN 2021. ADJUSTMENTS ARE MADE TO SALARIES ANNUALLY FOR MERIT INCREASES, WHICH ARE BASED ON FORMAL PERFORMANCE EVALUATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S BYLAWS AND KEY GOVERNANCE POLICIES ARE AVAILABLE TO THE PUBLIC ON THE STS WEBSITE. OTHER GOVERNING DOCUMENTS, AS WELL AS THE ORGANIZATION'S CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS ARE MADE AVAILABLE TO THE PUBLIC UPON WRITTEN REQUEST TO THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Line 2f Other Program Service Revenue</FormAndLineReferenceDesc>
        <ExplanationTxt>PUBLICATIONS &amp; SUBSCRIPTIONS - Total Revenue: 1721122, Related or Exempt Function Revenue: 1721122, Unrelated Business Revenue: , Revenue Excluded from Tax Under Sections 512, 513, or 514: ; ALL OTHER - Total Revenue: 372688, Related or Exempt Function Revenue: 372688, Unrelated Business Revenue: , Revenue Excluded from Tax Under Sections 512, 513, or 514: ;</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g Other Fees</FormAndLineReferenceDesc>
        <ExplanationTxt>CONSULTANT EXPENSES - Total Expense: 1257579, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ; TEMPORARY SERVICES FROM SALARIES - Total Expense: 126945, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ; VOLUNTEER STIPENDS FROM SALARIES - Total Expense: 275000, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ; PAYROLL AND HR FEES - Total Expense: 160425, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ; DATA WAREHOUSING AND ANALYSIS - Total Expense: 5839699, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ; VIDEO PRODUCTION - Total Expense: 49687, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ; CTSNET FEES - Total Expense: 20237, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ; MISCELLANEOUS - Total Expense: 137260, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ; TVT EXPENSE - Total Expense: 2708683, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ;</ExplanationTxt>
      </SupplementalInformationDetail>
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        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>20 F STREET NW</AddressLine1Txt>
          <AddressLine2Txt>SUITE 310C</AddressLine2Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20001</ZIPCd>
        </USAddress>
        <EIN>522017375</EIN>
        <PrimaryActivitiesTxt>POLITICAL ACTION COMMITTEE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>527</ExemptCodeSectionTxt>
        <ControlledOrganizationInd>false</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>THE THORACIC SURGERY FOUNDATION (TSF)</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>633 N ST CLAIR STREET</AddressLine1Txt>
          <AddressLine2Txt>SUITE 2100</AddressLine2Txt>
          <CityNm>CHICAGO</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60611</ZIPCd>
        </USAddress>
        <EIN>363635910</EIN>
        <PrimaryActivitiesTxt>RESEARCH AND EDUCATION</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>10</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>THE SOCIETY OF THORACIC SURGEONS</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>true</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>false</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>true</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>false</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>false</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>false</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>false</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>false</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>false</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>false</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>false</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>false</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>true</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>false</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>true</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>true</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>false</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>true</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>true</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>false</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>THE THORACIC SURGERY FOUNDATION</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>B</TransactionTypeTxt>
        <InvolvedAmt>320833</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>CASH PAID</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>