Symmetrical conjoined twins: an analysis of the birth records of twenty-two sets.
D001724:Birth Weight; D005260:Female; D005313:Fetal Death; D006801:Humans; D008297:Male; D008423:Maternal Age; D009518:New York; D010298:Parity; D011247:Pregnancy; D012621:Seasons; D012723:Sex; D014428:Twins, Conjoined