title: External quality assessment of urinary methylmalonic acid quantification - results of a pilot study.
authors.forename: Michael
authors.initials: M
authors.lastname: Vogeser
authors.forename: Wilhelm
authors.initials: W
authors.lastname: Müller
authors.forename: Stefan
authors.initials: S
authors.lastname: Lorenzl
mesh_terms: D019411:Clinical Laboratory Techniques / Q000592:standards*; D006801:Humans; D008764:Methylmalonic Acid / Q000652:urine*; D010865:Pilot Projects; D011785:Quality Assurance, Health Care; D011786:Quality Control
chemical_list: D008764:Methylmalonic Acid