http://hl7.org/fhir/StructureDefinition/openEHR-exposureDate|5.2.0

Record of the date and/or time of the first exposure to the Substance for this Reaction Event.
Base: http://hl7.org/fhir/StructureDefinition/Extension4.0.1, 5.0.0, 4.0.1
Type: Extension (a.k.a: http://hl7.org/fhir/StructureDefinition/Extension)
Type dependencies: 0
Elements