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        <PersonNm>Vinon H Thourani</PersonNm>
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        <PersonNm>John H Calhoon</PersonNm>
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        <PersonNm>Robert A Wynbrandt</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Keith J Bura</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>William F Seward</PersonNm>
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        <PersonNm>W Grahame Rush</PersonNm>
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        <PersonNm>Damon K Marquis</PersonNm>
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        <PersonNm>Natalie J Boden</PersonNm>
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        <PersonNm>Courtney Yohe Savage</PersonNm>
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        <PersonNm>DeLaine S Schmitz</PersonNm>
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        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>Accounting principles generally accepted in the United States of America require management to evaluate tax positions taken by the Society and recognize a tax liability if the Society 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 Society and has concluded that as of December 31, 2015, there are no uncertain positions taken or expected to be taken that would require recognition of a liability or disclosure in the financial statements, subject to the results of the IRS audit discussed immediately below. The Society is subject to routine audits by taxing jurisdictions. The IRS is in the process of examining STS 2011, 2012, and 2013 Forms 990 and 990-T. As of May 10, 2016, the examination is undergoing IRS administrative review. Management does not expect to make any adjustments. In addition, management believes it is no longer subject to income tax examinations related to STS for years prior to 2009.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART IV, LINE 11F</FormAndLineReferenceDesc>
        <ExplanationTxt>On August 11, 2015, the Society's received IRS Form 886A ("Revenue Agent Report") related to the IRS audit of STS Forms 990 and 990-T for 2011, 2012 and 2013, in which the IRS Revenue Agent responsible for the audit concluded that royalty revenue received by the Society in connection with The Annals of Thoracic Surgery was taxable income. The Society strongly disagrees with this conclusion, and therefore filed a letter of protest and request for appeal with the IRS on September 8, 2015. That appeal is now pending.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part I, line 3:</FormAndLineReferenceDesc>
        <ExplanationTxt>FAIR VALUE</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11</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 or senior corporate officers. Finally, the organization's senior officers met with management and discussed the return prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</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>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>15A. The Society engages an independent compensation consultant periodically, usually every two or three years, to perform a market salary analysis for the Executive Director &amp; General Counsel position. This information is shared with the Executive Committee which determines the new level of compensation and communicates the salary information to the Executive Director &amp; general counsel and to the Director of Finance &amp; Administration for implementation. AN INDEPENDENT COMPENSATION CONSULTANT WAS UTILIZED AS A PART OF THIS PROCESS IN 2015. An adjustment is made to the executive director &amp; general counsel's salary annually for a merit increase, which is based on a formal performance evaluation. 15b. Compensation - 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 the Executive Director &amp; General Counsel and each staff director 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 Executive Director &amp; General Counsel and THE Director of Finance &amp; Administration to review the compensation analysis, and makes adjustments to the analysis, as appropriate, based on additional data provided by the Executive Director &amp; General Counsel and Director of Finance &amp; Administration. Utilizing the consultant's analysis, the Executive Director &amp; General Counsel makes salary adjustments and communicates new salaries in writing to other key employees of the organization. AN INDEPENDENT COMPENSATION CONSULTANT WAS UTILIZED AS PART OF THIS PROCESS IN 2015. Adjustments are made to salaries annually for merit increases, which are based on formal performance evaluations.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</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 IX, line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>CONSULTANT EXPENSES 810,597. TEMP. SERVICES 91,859. VOLUNTEER STIPENDS 180,000. PAYROLL AND HR FEES 147,268. DATA AUDITING 486,466. DATA WAREHOUSING AND ANALYSIS 2,581,523. OTHER MISCELLANEOUS 41,866.</ExplanationTxt>
      </SupplementalInformationDetail>
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