http://hl7.org/fhir/StructureDefinition/consent-ResearchStudyContext|5.2.0

When a Research scope Consent, this is the specific research study that is allowed to use the information (or not).
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