http://hl7.org/fhir/StructureDefinition/openEHR-exposureDuration|4.0.1
The amount of time the individual was exposed to the Substance.
description: The amount of time the individual was exposed to the Substance. 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: [] index: 3 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/openEHR-exposureDuration base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.0.1 required: [value]