The risk of a major trisomy in fetuses with pyelectasis: the impact of an abnormal maternal serum screen or additional sonographic markers.
Bornstein E, Barnhard Y, Donnenfeld AE, Ferber A, Divon MY. The risk of a major trisomy in fetuses with pyelectasis: the impact of an abnormal maternal serum screen or additional sonographic markers. Am J Obstet Gynecol. 2007 May; 196(5):e24-6.