{description: candidate | eligible | follow-up | ineligible | not-registered | off-study | on-study | on-study-intervention | on-study-observation | pending-on-study | potential-candidate | screening | withdrawn, package_name: hl7.fhir.r5.core, name: subject_state, type: token, package_version: 5.0.0-ballot, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/ResearchSubject-subjectstate', version: 5.0.0-ballot}