[Ulcers. 3. The frequency of ulcers among 50-year-old men].
D004381:Duodenal Ulcer / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013276:Stomach Ulcer / Q000453:epidemiology*
Ulcussjukdomen. 3. Ulcusfrekvensen bland 50-åriga män.