description: The amount of time the individual was exposed to the Substance.
package_name: hl7.fhir.r4b.core
derivation: constraint
name: exposureDuration
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/openEHR-exposureDuration'}
    index: 1
  value:
    choices: [valueDuration]
    index: 3
  valueDuration: {type: Duration, choiceOf: value, index: 4}
package_version: 4.3.0
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/openEHR-exposureDuration
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 4.3.0
required: [value, valueDuration]