description: The age of the patient when the event occurred.
package_name: hl7.fhir.us.icsr-ae-reporting
derivation: constraint
name: AgeAtTimeOfOnset
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/us/icsr-ae-reporting/StructureDefinition/icsr-ext-ageattimeofonset'}
    index: 1
  value:
    mustSupport: true
    choices: [valueAge]
    index: 3
  valueAge: {type: Age, mustSupport: true, choiceOf: value, index: 4}
package_version: 1.0.1
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/us/icsr-ae-reporting/StructureDefinition/icsr-ext-ageattimeofonset
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 1.0.1
required: [valueAge, value]