title: External quality assurance--a personal view.
authors.forename: J
authors.initials: J
authors.lastname: Middle
mesh_terms: D019963:Clinical Chemistry Tests / Q000592:standards; D007753:Laboratories / Q000592:standards*; D011361:Professional Competence; D011785:Quality Assurance, Health Care; D012015:Reference Standards; D015203:Reproducibility of Results; D006113:United Kingdom