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          <AddressLine1Txt>11025 DOVER ST 1600</AddressLine1Txt>
          <CityNm>BROOMFIELD</CityNm>
          <StateAbbreviationCd>CO</StateAbbreviationCd>
          <ZIPCd>80021</ZIPCd>
        </ContributorUSAddress>
        <TotalContributionsAmt>6888</TotalContributionsAmt>
        <PersonContributionInd>X</PersonContributionInd>
      </ContributorInformationGrp>
      <ContributorInformationGrp>
        <ContributorNum>2</ContributorNum>
        <ContributorPersonNm>CENTINEL SPINE LLC</ContributorPersonNm>
        <ContributorUSAddress>
          <AddressLine1Txt>900 AIRPORT ROAD</AddressLine1Txt>
          <CityNm>WEST CHESTER</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19380</ZIPCd>
        </ContributorUSAddress>
        <TotalContributionsAmt>12000</TotalContributionsAmt>
        <PersonContributionInd>X</PersonContributionInd>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <DepreciationSchedule documentId="DepreciationSch">
      <DepreciationPropertyGrp>
        <PropertyDesc>LEASEHOLD IMPROVE</PropertyDesc>
        <AcquiredDt>2001-11-01</AcquiredDt>
        <CostOrOtherBasisAmt>224622</CostOrOtherBasisAmt>
        <PriorYearDepreciationAmt>224622</PriorYearDepreciationAmt>
        <ComputationMethodTxt>SL</ComputationMethodTxt>
        <LifeRt>15</LifeRt>
      </DepreciationPropertyGrp>
      <DepreciationPropertyGrp>
        <PropertyDesc>COMPUTER &amp; EQUIP</PropertyDesc>
        <AcquiredDt>2014-06-17</AcquiredDt>
        <CostOrOtherBasisAmt>39478</CostOrOtherBasisAmt>
        <PriorYearDepreciationAmt>39478</PriorYearDepreciationAmt>
        <ComputationMethodTxt>SL</ComputationMethodTxt>
        <LifeRt>5</LifeRt>
      </DepreciationPropertyGrp>
      <DepreciationPropertyGrp>
        <PropertyDesc>FURNITURE &amp; FIX</PropertyDesc>
        <AcquiredDt>2012-06-01</AcquiredDt>
        <CostOrOtherBasisAmt>73871</CostOrOtherBasisAmt>
        <PriorYearDepreciationAmt>73871</PriorYearDepreciationAmt>
        <ComputationMethodTxt>SL</ComputationMethodTxt>
        <LifeRt>7</LifeRt>
      </DepreciationPropertyGrp>
      <DepreciationPropertyGrp>
        <PropertyDesc>ARTWORK</PropertyDesc>
        <AcquiredDt>2005-04-14</AcquiredDt>
        <CostOrOtherBasisAmt>18245</CostOrOtherBasisAmt>
        <PriorYearDepreciationAmt>0</PriorYearDepreciationAmt>
      </DepreciationPropertyGrp>
      <DepreciationPropertyGrp>
        <PropertyDesc>COMPUTER &amp; EQUIP</PropertyDesc>
        <AcquiredDt>2019-12-23</AcquiredDt>
        <CostOrOtherBasisAmt>6900</CostOrOtherBasisAmt>
        <PriorYearDepreciationAmt>5175</PriorYearDepreciationAmt>
        <ComputationMethodTxt>SL</ComputationMethodTxt>
        <LifeRt>5</LifeRt>
        <CurrentYearExpenseAmt>1380</CurrentYearExpenseAmt>
      </DepreciationPropertyGrp>
    </DepreciationSchedule>
    <LandEtcSchedule2 documentId="LandEtcSch2">
      <LandEtcGrp>
        <CategoryOrItemTxt>LEASEHOLD IMPROVE</CategoryOrItemTxt>
        <CostOrOtherBasisAmt>224622</CostOrOtherBasisAmt>
        <AccumulatedDepreciationAmt>224622</AccumulatedDepreciationAmt>
      </LandEtcGrp>
      <LandEtcGrp>
        <CategoryOrItemTxt>COMPUTER &amp; EQUIP</CategoryOrItemTxt>
        <CostOrOtherBasisAmt>39478</CostOrOtherBasisAmt>
        <AccumulatedDepreciationAmt>39478</AccumulatedDepreciationAmt>
      </LandEtcGrp>
      <LandEtcGrp>
        <CategoryOrItemTxt>FURNITURE &amp; FIX</CategoryOrItemTxt>
        <CostOrOtherBasisAmt>73871</CostOrOtherBasisAmt>
        <AccumulatedDepreciationAmt>73871</AccumulatedDepreciationAmt>
      </LandEtcGrp>
      <LandEtcGrp>
        <CategoryOrItemTxt>ARTWORK</CategoryOrItemTxt>
        <CostOrOtherBasisAmt>18245</CostOrOtherBasisAmt>
        <AccumulatedDepreciationAmt>0</AccumulatedDepreciationAmt>
        <BookValueAmt>18245</BookValueAmt>
      </LandEtcGrp>
      <LandEtcGrp>
        <CategoryOrItemTxt>COMPUTER &amp; EQUIP</CategoryOrItemTxt>
        <CostOrOtherBasisAmt>6900</CostOrOtherBasisAmt>
        <AccumulatedDepreciationAmt>6555</AccumulatedDepreciationAmt>
        <BookValueAmt>345</BookValueAmt>
      </LandEtcGrp>
    </LandEtcSchedule2>
    <OtherExpensesSchedule documentId="OtherExpensesSch">
      <OtherExpensesScheduleGrp>
        <Desc>POSTAGE</Desc>
        <RevenueAndExpensesPerBooksAmt>13</RevenueAndExpensesPerBooksAmt>
        <DisbursementsCharitablePrpsAmt>13</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>GRANT EXPENSE</Desc>
        <RevenueAndExpensesPerBooksAmt>3032</RevenueAndExpensesPerBooksAmt>
        <DisbursementsCharitablePrpsAmt>3032</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>DUES, MEMBERSHIPS, &amp; LICENSES</Desc>
        <RevenueAndExpensesPerBooksAmt>111</RevenueAndExpensesPerBooksAmt>
        <DisbursementsCharitablePrpsAmt>111</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>MARKETING</Desc>
        <RevenueAndExpensesPerBooksAmt>240</RevenueAndExpensesPerBooksAmt>
        <DisbursementsCharitablePrpsAmt>240</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>FELLOW EXPENSE</Desc>
        <RevenueAndExpensesPerBooksAmt>3292</RevenueAndExpensesPerBooksAmt>
        <AdjustedNetIncomeAmt>3292</AdjustedNetIncomeAmt>
      </OtherExpensesScheduleGrp>
    </OtherExpensesSchedule>
    <OtherIncomeSchedule2 documentId="OtherIncomeSch2">
      <OtherIncomeDetail>
        <Desc>RESEARCH REVENUE</Desc>
        <RevenueAndExpensesPerBooksAmt>11167</RevenueAndExpensesPerBooksAmt>
        <AdjustedNetIncomeAmt>11167</AdjustedNetIncomeAmt>
      </OtherIncomeDetail>
    </OtherIncomeSchedule2>
    <SubstantialContributorsSch documentId="SubsContributorsSch">
      <SubstantialContributorDetail>
        <PersonNm>CENTINEL SPINE LLC</PersonNm>
        <USAddress>
          <AddressLine1Txt>900 AIRPORT ROAD</AddressLine1Txt>
          <CityNm>WEST CHESTER</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19380</ZIPCd>
        </USAddress>
      </SubstantialContributorDetail>
    </SubstantialContributorsSch>
    <TaxesSchedule documentId="TaxesSchedule">
      <TaxesDetail>
        <CategoryTxt>PAYROLL</CategoryTxt>
        <Amt>568</Amt>
        <DisbursementsCharitablePrpsAmt>568</DisbursementsCharitablePrpsAmt>
      </TaxesDetail>
    </TaxesSchedule>
  </ReturnData>
</Return>