Tsao KuoJen, Chuang Nathaniel A, Filly Roy A, Barkovich Anthony J, Goldstein Ruth B
Fetal Treatment Center, Department of Surgery, University of California, San Francisco Medical Center, 94143-0628, USA.
J Ultrasound Med. 2002 Jan;21(1):91-6. doi: 10.7863/jum.2002.21.1.91.