Bowel diseases in rural blacks.
D001741:Black or African American; D001064:Appendicitis / Q000453:epidemiology; D044383:Black People; D003093:Colitis, Ulcerative / Q000453:epidemiology; D004240:Diverticulum / Q000453:epidemiology; D006484:Hemorrhoids / Q000453:epidemiology; D006801:Humans; D007410:Intestinal Diseases / Q000453:epidemiology*; D007414:Intestinal Neoplasms / Q000453:epidemiology; D007417:Intestinal Polyps / Q000453:epidemiology; D012424:Rural Population; D013019:South Africa; D014505:Urban Population