[On serum vitamin B12 content in leukemias].
D045728:Corrinoids; D006397:Hematinics; D007938:Leukemia / Q000097:blood*; D014805:Vitamin B 12 / Q000097:blood*
D045728:Corrinoids; D006397:Hematinics; D014805:Vitamin B 12
LEUKEMIA/blood; VITAMIN B 12/blood