http://hl7.org/fhir/StructureDefinition/allergyintolerance-duration|5.2.0

The amount of time that the Adverse Reaction persisted.
NameFlagsCardTypeDescription & Constraints
Extension
0..1How long Manifestations persisted
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueDuration *
1..?Duration