title: A regional quality control scheme for urine porphyrins.
authors.affiliation: Department of Chemical Pathology, St. Stephens Hospital, London, UK.
authors.forename: J F
authors.initials: JF
authors.lastname: Stevens
mesh_terms: D002624:Chemistry, Clinical / Q000379:methods; D006801:Humans; D011166:Porphyrins / Q000652:urine*; D011786:Quality Control; D011795:Surveys and Questionnaires
chemical_list: D011166:Porphyrins