[Serum vitamin B12 and megaloblastosis in malignant blood diseases].
D000740:Anemia; D000747:Anemia, Hypochromic / Q000175:diagnosis*; D045728:Corrinoids; D006402:Hematologic Diseases; D006801:Humans; D011087:Polycythemia Vera / Q000175:diagnosis*; D014805:Vitamin B 12 / Q000097:blood*
D045728:Corrinoids; D014805:Vitamin B 12
ANEMIA, HYPOCHROMIC/diagnosis; POLYCYTHEMIA VERA/diagnosis; VITAMIN B 12/blood