Twin births and genetic counseling.
D000015:Abnormalities, Multiple / Q000235:genetics; D001006:Anus, Imperforate / Q000235:genetics; D003376:Counseling; D004200:Diseases in Twins / Q000235:genetics; D005260:Female; D005826:Genetics, Medical; D006801:Humans; D007021:Hypospadias / Q000235:genetics; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D014138:Tracheoesophageal Fistula / Q000151:congenital / Q000235:genetics; D014427:Twins