Prevalence of peptic ulcer and its complications.
D000328:Adult; D002940:Circadian Rhythm; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010437:Peptic Ulcer / Q000453:epidemiology*; D010439:Peptic Ulcer Perforation / Q000453:epidemiology; D012606:Scotland; D012621:Seasons; D012737:Sex Factors