<?xml version="1.0" encoding="UTF-8"?><ResearchSubject xmlns="http://hl7.org/fhir">
  <id value="example-crossover-placebo-to-drug"/>
  <meta>
    <security>
      <system value="http://terminology.hl7.org/CodeSystem/v3-ActReason"/>
      <code value="HTEST"/>
      <display value="test health data"/>
    </security>
  </meta>
  <identifier>
    <value value="ecsr45"/>
  </identifier>
  <status value="active"/>
  <period>
    <start value="2022-06-10"/>
  </period>
  <study>
    <reference value="example-ctgov-study-record"/>
  </study>
  <subject>
    <reference value="cfsb1676546565857"/>
  </subject>
  <comparisonGroup>
    <concept>
      <coding>
        <system value="http://hl7.org/fhir/example-comparison-group"/>
        <code value="placebo"/>
        <display value="Placebo"/>
      </coding>
    </concept>
  </comparisonGroup>
  <comparisonGroup>
    <concept>
      <text value="ap303"/>
    </concept>
  </comparisonGroup>
</ResearchSubject>