Vitamin-B12 deficiency due to defective diet.
D000368:Aged; D000740:Anemia / Q000209:etiology*; D004032:Diet; D006801:Humans; D014806:Vitamin B 12 Deficiency; D014815:Vitamins
D014815:Vitamins
ANEMIA, HYPERCHROMIC/etiology and pathogenesis; VITAMIN B12 DEFICIENCY/in aged