description: Specifies the reporting period for the measure. package_name: hl7.fhir.us.cqfmeasures derivation: constraint name: EffectivePeriodDuration type: Extension elements: url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-effectivePeriodDuration'} index: 0 value: choices: [valueDuration] index: 2 valueDuration: {type: Duration, choiceOf: value, index: 3} package_version: 2.0.0 class: extension kind: complex-type url: http://hl7.org/fhir/us/cqfmeasures/StructureDefinition/cqfm-effectivePeriodDuration base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.0.0