Perforated peptic ulcer in North-East Scotland 1972-1981. Part 1: epidemiology.
D000293:Adolescent; D000328:Adult; D000368:Aged; D004381:Duodenal Ulcer / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010439:Peptic Ulcer Perforation / Q000453:epidemiology*; D012606:Scotland; D013276:Stomach Ulcer / Q000453:epidemiology*