title: Postoperative chest infection.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002763:Cholecystectomy; D002764:Cholecystitis / Q000601:surgery*; D002908:Chronic Disease; D004381:Duodenal Ulcer / Q000601:surgery*; D005260:Female; D006801:Humans; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D009790:Occupations; D011183:Postoperative Complications / Q000453:epidemiology*; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000209:etiology*; D012189:Retrospective Studies; D012621:Seasons; D012737:Sex Factors; D012907:Smoking; D013183:Sputum / Q000382:microbiology; D014628:Vagotomy