title: Some experiments of nature on the problem of peptic ulcer.
mesh_terms: D004381:Duodenal Ulcer / Q000209:etiology; D005750:Gastric Juice / Q000378:metabolism; D006801:Humans; D007410:Intestinal Diseases / Q000209:etiology; D010437:Peptic Ulcer / Q000209:etiology*; D013276:Stomach Ulcer / Q000209:etiology