Congenital malformations in twins.
D000015:Abnormalities, Multiple / Q000235:genetics; D000757:Anencephaly / Q000235:genetics; D002971:Cleft Lip / Q000235:genetics; D002972:Cleft Palate / Q000235:genetics; D000013:Congenital Abnormalities / Q000235:genetics*; D004200:Diseases in Twins / Q000151:congenital*; D004314:Down Syndrome / Q000235:genetics; D005260:Female; D005532:Foot Deformities, Congenital; D006228:Hand Deformities, Congenital; D006330:Heart Defects, Congenital / Q000235:genetics; D006801:Humans; D006849:Hydrocephalus / Q000235:genetics; D008297:Male; D012723:Sex; D016135:Spinal Dysraphism / Q000235:genetics