title: Vitamin B12 deficiency following Polya gastrectomy. A long-term follow-up.
mesh_terms: D000328:Adult; D000368:Aged; D004911:Erythrocyte Volume; D005260:Female; D005500:Follow-Up Studies; D005743:Gastrectomy / Q000009:adverse effects*; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D014805:Vitamin B 12 / Q000097:blood; D014806:Vitamin B 12 Deficiency / Q000209:etiology*
chemical_list: D006454:Hemoglobins; D014805:Vitamin B 12