description: The head circumference is the size of the head as measured around the head. package_name: rs/nictiz.fhir.nl.r4.nl derivation: constraint name: NlcoreHeadCircumference type: Observation elements: subject: type: Reference refers: ['http://hl7.org/fhir/StructureDefinition/Patient', 'http://nictiz.nl/fhir/StructureDefinition/nl-core-Patient'] index: 0 package_version: core-0.8.0-beta.1 class: profile kind: resource url: http://nictiz.nl/fhir/StructureDefinition/nl-core-HeadCircumference base: http://nictiz.nl/fhir/StructureDefinition/zib-HeadCircumference version: null