{description: 'Drugs, devices, etc. under study, as a reference', package_name: hl7.fhir.r6.core, name: focus-reference, type: reference, package_version: 6.0.0-ballot3, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/ResearchStudy-focus-reference', version: 6.0.0-ballot3}