Vitamin B12 deficiency.
D000328:Adult; D000368:Aged; D000752:Anemia, Pernicious / Q000188:drug therapy; D005260:Female; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D007408:Intestinal Absorption / Q000187:drug effects; D008297:Male; D008875:Middle Aged; D009748:Nutrition Disorders / Q000188:drug therapy; D011247:Pregnancy; D014805:Vitamin B 12 / Q000097:blood / Q000627:therapeutic use*; D014806:Vitamin B 12 Deficiency / Q000097:blood / Q000175:diagnosis / Q000188:drug therapy*
D006454:Hemoglobins; D014805:Vitamin B 12