title: External quality control of urinary methyl malonic acid quantification - announcement 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: D006801:Humans; D008764:Methylmalonic Acid / Q000652:urine*; D010865:Pilot Projects; D011786:Quality Control
chemical_list: D008764:Methylmalonic Acid