ABO and Rh blood groups in relation to blood donors' sibs.
D000017:ABO Blood-Group System; D000328:Adult; D001782:Blood Donors; D001789:Blood Group Antigens; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012204:Rh-Hr Blood-Group System; D012744:Sex Ratio; D013223:Statistics as Topic
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D012204:Rh-Hr Blood-Group System