On the spread of the blood-group-incompatible married couples in Bulgaria.
D000017:ABO Blood-Group System; D001787:Blood Group Incompatibility / Q000453:epidemiology*; D002031:Bulgaria; D004899:Erythroblastosis, Fetal / Q000453:epidemiology; D005191:Family Characteristics; D005260:Female; D006650:Histocompatibility Testing; D006801:Humans; D008297:Male; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System
D000017:ABO Blood-Group System; D012204:Rh-Hr Blood-Group System