http://hl7.org/fhir/StructureDefinition/workflow-researchStudy|5.2.0

Indicates that this event is relevant to the specified research study(ies).
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/Reference
Extension.value[x].targetProfilehttp://hl7.org/fhir/StructureDefinition/ResearchStudy