Responsibility after gastrectomy.
D000126:Achlorhydria; D005743:Gastrectomy / Q000009:adverse effects*; D006801:Humans; D009461:Neurologic Manifestations; D011182:Postoperative Care; D011183:Postoperative Complications; D014805:Vitamin B 12 / Q000097:blood; D014806:Vitamin B 12 Deficiency / Q000209:etiology
D014805:Vitamin B 12