Unballoted STU Update Publication of HL7 FHIR® Implementation Guide: Clinical Data Exchange (CDex), Release 1- US Realm STU2.1.0
Learn more at https://www.hl7.org/implement/standards/product_brief.cfm?product_id=590 or see the specification at https://hl7.org/fhir/us/davinci-cdex/STU2.1