Dezerega Victor, Be Cecilia, Wong Amy E, Silva Rafael, Sepulveda Waldo
Fetal Medicine Center, Department of Obstetrics and Gynecology, Clinica Las Condes, Casilla 208, Santiago 20, Chile.
J Ultrasound Med. 2005 May;24(5):717-9. doi: 10.7863/jum.2005.24.5.717.