Unballoted STU Update Publication of HL7 FHIR® Implementation Guide: Health Record Exchange (HRex) Framework, Edition 1.2 – US Realm
Learn more at https://www.hl7.org/implement/standards/product_brief.cfm?product_id=589 or see the specification at http://hl7.org/fhir/us/davinci-hrex/1.2.0