Duodenal ulcer in the Johannesburg urban African.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D044383:Black People; D004381:Duodenal Ulcer / Q000453:epidemiology* / Q000378:metabolism; D005260:Female; D005750:Gastric Juice / Q000378:metabolism; D006801:Humans; D008297:Male; D010439:Peptic Ulcer Perforation / Q000453:epidemiology; D011707:Pyloric Stenosis / Q000453:epidemiology; D013019:South Africa; D014505:Urban Population