title: Recurrence of duodenal ulcer--an endoscopic study.
mesh_terms: D000328:Adult; D000368:Aged; D004381:Duodenal Ulcer / Q000188:drug therapy / Q000209:etiology*; D004724:Endoscopy; D005745:Gastric Acidity Determination; D006635:Histamine H2 Antagonists / Q000627:therapeutic use; D006801:Humans; D008875:Middle Aged; D012008:Recurrence; D013997:Time Factors
chemical_list: D006635:Histamine H2 Antagonists