STU Update Publication for HL7 FHIR® Implementation Guide: Payer Data Exchange (PDex) Drug Formulary, Release 1 – US Realm
Learn more at https://www.hl7.org/implement/standards/product_brief.cfm?product_id=517 or see the standard at
http://hl7.org/fhir/us/Davinci-drug-formulary/STU1.1