title: A modification to a radioisotopic dilution technique for vitamin B12.
mesh_terms: D001205:Ascorbic Acid; D006801:Humans; D007437:Intrinsic Factor; D008722:Methods; D011865:Radioisotope Dilution Technique; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D007437:Intrinsic Factor; D014805:Vitamin B 12; D001205:Ascorbic Acid