title: Duodenal ulcer, largely an urban disease in Africans in subtropical Africa.
mesh_terms: D000293:Adolescent; D000328:Adult; D000349:Africa; D002648:Child; D004381:Duodenal Ulcer / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D014505:Urban Population