[B 12 hypovitaminosis].
D000752:Anemia, Pernicious / Q000209:etiology*; D006801:Humans; D001523:Mental Disorders / Q000209:etiology*; D009461:Neurologic Manifestations / Q000209:etiology*; D014806:Vitamin B 12 Deficiency / Q000150:complications*
B12-hypovitaminosis.