The distribution of the secreting types among the Bulgarians.
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D001826:Body Fluids; D002031:Bulgaria; D005826:Genetics, Medical; D006801:Humans; D066298:In Vitro Techniques; D012636:Secretory Rate
D000017:ABO Blood-Group System; D001789:Blood Group Antigens