On the comparative frequency of certain gastrointestinal diseases and their complications among American Negroes.
D044383:Black People; D005260:Female; D005767:Gastrointestinal Diseases / Q000453:epidemiology*; D006471:Gastrointestinal Hemorrhage / Q000453:epidemiology; D006801:Humans; D008103:Liver Cirrhosis / Q000453:epidemiology / Q000401:mortality; D008297:Male; D010437:Peptic Ulcer / Q000150:complications / Q000453:epidemiology; D010439:Peptic Ulcer Perforation / Q000453:epidemiology; D014481:United States; D044465:White People; D001741:Black or African American