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        <ExplanationTxt>The Foundation is exempt from income tax under the provisions of Internal Revenue Code Section 501(c)(3). Accounting principles generally accepted in the United States of America require management to evaluate tax positions taken by the Foundation and recognize a tax liability if the Foundation has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS or other applicable taxing authorities. Management has analyzed the tax positions taken by the Foundation and has concluded that as of the year ended December 31, 2016, there are no uncertain positions taken or expected to be taken that would require recognition of a liability or disclosure in the financial statements.</ExplanationTxt>
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        <ExplanationTxt>THE SOCIETY OF THORACIC SURGEONS (STS) OF CHICAGO, ILLINOIS, MAINTAINS THE BOOKS AND RECORDS OF THE ORGANIZATION AND PERFORMS OTHER RELATED MANAGERIAL AND ADMINISTRATIVE FUNCTIONS FOR WHICH IT IS COMPENSATED.</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>THE 990 IS REVIEWED BY THE ADMINISTRATIVE STAFF OF THE MANAGEMENT COMPANY (STS) AND IS THEN PROVIDED TO THE TREASURER, AND THEN GOVERNING BODY, FOR FINAL REVIEW BEFORE IT IS FILED.</ExplanationTxt>
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</Return>