Changing aspects of peptic ulcer disease.
D004381:Duodenal Ulcer / Q000453:epidemiology / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010437:Peptic Ulcer / Q000453:epidemiology / Q000601:surgery*; D012189:Retrospective Studies; D013276:Stomach Ulcer / Q000453:epidemiology / Q000601:surgery