The ABO and RH (D) blood groups in rheumatoid arthritis.
D000017:ABO Blood-Group System / Q000032:analysis*; D001172:Arthritis, Rheumatoid / Q000097:blood*; D006801:Humans; D012204:Rh-Hr Blood-Group System / Q000032:analysis*; D013223:Statistics as Topic
D000017:ABO Blood-Group System; D012204:Rh-Hr Blood-Group System