The ABO blood groups in relation to carcinoma of the stomach and duodenal ulcer in a Nigerian community.
D000017:ABO Blood-Group System; D002277:Carcinoma / Q000097:blood*; D004381:Duodenal Ulcer / Q000097:blood*; D006801:Humans; D009549:Nigeria; D013274:Stomach Neoplasms / Q000097:blood*
D000017:ABO Blood-Group System