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<?xml version="1.0" encoding="UTF-8"?>
<ItemGroupDef OID="ODM.IG.LB.WBC" Name="WBC Lab Results with Unit" Repeating="No" Type="Section" >
    <!-- The Subject Identifier -->
    <ItemRef ItemOID="ODM.IT.SUBJID" Mandatory="Yes" />
    <!-- Collected Leukocytes (White Blood Count) with units -->
    <!-- The value itself -->
    <!-- Remark the reference to the units item using UnitsItemOID -->
    <ItemRef ItemOID="ODM.IT.LB.WBC.LBORRES" Mandatory="Yes" UnitsItemOID="ODM.IT.LB.WBC.LBORRESU" />
    <!-- The units for the leukocytes measurement -->
    <ItemRef ItemOID="ODM.IT.LB.WBC.LBORRESU" Mandatory="Yes" />
    <!-- LOINC code of the test to be performed -->
    <Coding Code="26464-8" System="http://loinc.org" SystemName="LOINC" SystemVersion="2.92"/>
	<!-- Alternative way of stating the origin of the data in the group, 
		as coming from an Electronic Health Record using the FHIR API, 
		retrieved by the investigator -->
 	<Origin Type="Collected" Source="Investigator">
    	<Source><SourceItems>
			<SourceItem><SourceItem ItemOID="ODM.IT.LB.SUBJID">
            	<!-- The Subject-ID is obtained from ResearchSubject.identifier -->
				<!-- The ItemOID references the ItemDef providing the metadata -->
                <Resource Type="HL7-FHIR" Name="ResearchSubject" Attribute="identifier" ItemOID="ODM.IT.LB.SUBJID"/>
            </SourceItem>
		 	<SourceItem><SourceItem ItemOID="ODM.IT.LB.WBC.LBORRES">
				<!-- The value itself is obtained from Observation.valueQuantity.value -->
			 	<!-- The ItemOID references the ItemDef providing the metadata -->
                <Resource Type="HL7-FHIR" Name="Observation" Attribute="valueQuantity.value" ItemOID="ODM.IT.LB.WBC.LBORRES"/>
            </SourceItem>
             <SourceItem><SourceItem ItemOID="ODM.IT.LB.WBC.LBORRESU">
				<!-- The value itself is obtained from Observation.valueQuantity.unit -->
			 	<!-- The ItemOID references the ItemDef providing the metadata -->
				<Resource Type="HL7-FHIR" Name="Observation" Attribute="valueQuantity.unit" ItemOID="ODM.IT.LB.WBC.LBORRESU"/>
			</SourceItem>
        </Source>SourceItems>
   </Origin>
</ItemGroupDef>