title: Letter: Natural history of atrophic gastritis.
mesh_terms: D000126:Achlorhydria / Q000150:complications; D000752:Anemia, Pernicious / Q000209:etiology; D001323:Autoantibodies / Q000302:isolation & purification; D001327:Autoimmune Diseases; D005756:Gastritis / Q000150:complications* / Q000276:immunology; D006801:Humans; D008286:Malabsorption Syndromes / Q000209:etiology; D014805:Vitamin B 12 / Q000378:metabolism
chemical_list: D001323:Autoantibodies; D014805:Vitamin B 12