Distribution of ABO blood groups in patients with ulcer disease. Its relationship to gastroduodenal bleeding.
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D004381:Duodenal Ulcer; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000453:epidemiology*; D006115:Greece; D006801:Humans; D008297:Male; D010437:Peptic Ulcer / Q000453:epidemiology*; D013276:Stomach Ulcer
D000017:ABO Blood-Group System; D001789:Blood Group Antigens