Oyelese Yinka, Tchabo Jean-Gilles, Chapin Brian, Nair Anitha, Hanson Patricia, McLaren Rodney
Department of Obstetrics and Gynecology, Georgetown University Medical Center, Washington, DC, USA.
J Ultrasound Med. 2003 Sep;22(9):977-80. doi: 10.7863/jum.2003.22.9.977.