title: PAT Program. Background and current status.
authors.forename: C A
authors.initials: CA
authors.lastname: Esche
authors.forename: J H
authors.initials: JH
authors.lastname: Groff
mesh_terms: D006801:Humans; D007753:Laboratories / Q000592:standards*; D016272:Occupational Health; D012015:Reference Standards; D014481:United States