title: Gastroduodenal ulcer perforation.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000009:adverse effects*; D006801:Humans; D008875:Middle Aged; D010439:Peptic Ulcer Perforation / Q000139:chemically induced*; D012189:Retrospective Studies
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal