Vitamin B12 deficiency after gastric bypass surgery for obesity.
D004906:Erythrocyte Count; D004909:Erythrocyte Indices; D006801:Humans; D009765:Obesity / Q000628:therapy*; D011178:Postgastrectomy Syndromes / Q000209:etiology*; D014805:Vitamin B 12 / Q000097:blood / Q000627:therapeutic use; D014806:Vitamin B 12 Deficiency / Q000188:drug therapy / Q000209:etiology*
D014805:Vitamin B 12