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