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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Association is exempt from federal income tax under Section 501(c)(3) of the Internal Revenue Code. However, income from certain activities not directly related to the Association 's tax-exempt purpose is subject to taxation as unrelated business income. In addition, the Association qualifies for the charitable contribution deduction under Section 170(b)(1)(A) and has been classified as an organization other than a private foundation under Section 509(a)(2). GAAP requires entities to evaluate, measure, recognize and disclose any uncertain income tax positions taken on their tax returns. GAAP prescribes a minimum threshold that a tax position is required to meet in order to be recognized in the financial statements. The Association believes that it had no uncertain tax positions as defined in GAAP.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I Description of Procedure for Monitoring Use of Funds</FormAndLineReferenceDesc>
        <ExplanationTxt>APPLICANTS MUST BE A CURRENT ARO MEMBER AT THE TIME OF APPLICATION AND AT THE TIME OF THE CONFERENCE. ARO MONITORS THE USE OF GRANT FUNDS BY VERIFYING GRANTEES' ATTENDENCE AND TRAVEL COSTS FOR THE MEETING. THE BOARD OF DIRECTORS APPROVES THE SELECTION OF GRANT RECIPIENTS AND DISBURSEMENT OF GRANT FUNDS.</ExplanationTxt>
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    </IRS990ScheduleI>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IIII, LINE 1, DESCRIPTION OF ORGANIZATION MISSION:</FormAndLineReferenceDesc>
        <ExplanationTxt>TO ACHIEVE THESE OBJECTIVES, AND TO FOSTER COLLEGIAL ASSEMBLY AND STIMULATE SCIENTIFIC COLLABORATION AMONG ITS MEMBERS, THE ASSOCIATION SHALL ENCOURAGE YEAR-ROUND SCIENTIFIC ENGAGEMENT THROUGH MEETINGS AND OTHER ACTIVITIES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 4A - PROGRAM SERVICE ACCOMPLISHMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>ARO HOSTS A MIDWINTER MEETING EVERY YEAR FOR MEMBERSHIP AND GUESTS TO ATTEND TO STAY UPDATED ON RECENT SCIENCE IN THE FIELD. THE MIDWINTER MEETING IS HELD EACH YEAR. THE PROGRAM INCLUDES BOTH CONTRIBUTED PAPER SESSIONS AND SPECIAL SEMINARS, WORKSHOPS AND A SHORT COURSE WITH INVITED SPEAKERS ON TOPICS OF CURRENT INTEREST AND IMPORTANCE TO THE ARO MEMBERSHIP. THE MEETING ABSTRACTS ARE AVAILABLE TO MEETING ATTENDEES IN DIGITAL FORM PRIOR TO THE MEETING. THE ABSTRACTS ARE ALSO AVAILABLE ON THE ARO WEBSITE AFTER THE MEETING. THE ARO ENCOURAGES AN INFORMAL ATMOSPHERE AT THIS MEETING IN ORDER THAT THE PARTICIPANTS HAVE MAXIMAL OPPORTUNITY TO EXCHANGE INFORMATION. THIS INFORMAL SETTING IS ESPECIALLY IMPORTANT FOR YOUNG SCIENTISTS OR CLINICIANS IN THEIR ATTEMPT TO LEARN ABOUT THE BROAD FIELD OF SCIENTIFIC OTOLARYNGOLOGY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3:</FormAndLineReferenceDesc>
        <ExplanationTxt>PARTHENON MANAGEMENT GROUP PROVIDES MANAGEMENT SERVICES. THE SERVICES INCLUDE GENERAL OPERATIONS AND TECHNOLOGY SERVICES, GOVERNANCE SUPPORT, MEMBERSHIP MANAGEMENT AND COMMUNICATION, MEETING MANAGEMENT, AND ACCOUNTING SERVICES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6:</FormAndLineReferenceDesc>
        <ExplanationTxt>ARO SHALL HAVE ONE CLASS OF VOTING MEMBER: REGULAR MEMBER. REGULAR MEMBERS HAVE THE RIGHT TO VOTE AND HOLD OFFICE. REGULAR MEMBERS ARE ANY PERSON WITH ESTABLISHED COMPETENCE IN RESEARCH IN THE CLINICAL AND/OR BASIC SCIENCES AS THEY RELATE TO OTOLARYNGOLOGY, WHO EXHIBITS AN INTEREST IN SUPPORTING THE GOALS OF THE ASSOCIATION, AND WHO HAS DEMONSTRATED THESE QUALITIES BY THEIR ACTIONS AND SCIENTIFIC PUBLICATIONS IS ELIGIBLE FOR REGULAR MEMBERSHIP. TO BECOME A REGULAR MEMBER, A CANDIDATE MUST BE PROPOSED FOR MEMBERSHIP BY AT LEAST ONE MEMBER IN GOOD STANDING. THE PROPOSING MEMBER IS RESPONSIBLE FOR REVIEWING THE APPLICANT'S CURRICULUM VITAE (OR OTHER EVIDENCE OF RESEARCH INTEREST AND COMPETENCE), AND THE EXECUTIVE DIRECTOR OR THEIR DESIGNEE SHALL CONFIRM THE PROPOSING MEMBER'S APPROVAL. ARO HAS THREE CLASSES OF MEMBERS THAT ARE NOT ELIGIBLE TO VOTE OR HOLD OFFICE: (1) ASSOCIATE MEMBER, (2) SENIOR MEMBER, (3) HONORARY MEMBER.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A:</FormAndLineReferenceDesc>
        <ExplanationTxt>A NOMINATING COMMITTEE PUTS FORTH A COMPETITIVE BALLOT AND MEMBERS VOTE THROUGH A SECURED ELECTRONIC VOTING SITE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B:</FormAndLineReferenceDesc>
        <ExplanationTxt>A NOMINATING COMMITTEE PUTS FORTH A COMPETITIVE BALLOT AND MEMBERS VOTE THROUGH A SECURED ELECTRONIC VOTING SITE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS PREPARED BY AN INDEPENDENT ACCOUNTING FIRM. THE PRESIDENT AND TREASURER WILL REVIEW AND APPROVE THE FORM 990 BEFORE IT IS FILED WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C:</FormAndLineReferenceDesc>
        <ExplanationTxt>ARO HAS AN ANNUAL CONFLICTS OF INTEREST POLICY AND REPORTING STRUCTURE FOR CHANGES.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS ARE MADE AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
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</Return>