The Twin Register of Budapest.
D001724:Birth Weight; D001789:Blood Group Antigens; D005260:Female; D006801:Humans; D006814:Hungary; D007231:Infant, Newborn; D008297:Male; D008499:Medical Records; D010920:Placenta; D011247:Pregnancy; D012042:Registries; D012744:Sex Ratio; D014310:Triplets; D014427:Twins
D001789:Blood Group Antigens