title: Proficiency Analytical Testing (PAT) Program (November 30, 1996).
authors.affiliation: DHHS/PHS/CDC/NIOSH, Robert A. Taft Laboratories, Cincinnati, OH 45226, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Esche
authors.forename: J H
authors.initials: JH
authors.lastname: Groff
mesh_terms: D002487:Centers for Disease Control and Prevention, U.S.; D002623:Chemistry Techniques, Analytical / Q000592:standards*; D004782:Environmental Health; D004784:Environmental Monitoring / Q000592:standards*; D006801:Humans; D007753:Laboratories / Q000592:standards*; D009314:National Institute for Occupational Safety and Health, U.S.; D016272:Occupational Health; D011786:Quality Control; D012955:Societies, Medical; D014481:United States