Lee W, Espinoza J, Cutler N, Bronsteen R A, Yeo L, Romero R
Division of Fetal Imaging, Department of Obstetrics and Gynecology, William Beaumont Hospital, Royal Oak, MI 48073-6769, USA.
Ultrasound Obstet Gynecol. 2010 Jan;35(1):124-5. doi: 10.1002/uog.7503.