Bell Jason D, Awonuga Awoniyi O, Thompson Margaret E, Ray Chadburn B, Devoe Lawrence D
Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta, Georgia, USA.
Int J Gynaecol Obstet. 2009 Sep;106(3):259-60. doi: 10.1016/j.ijgo.2009.03.054. Epub 2009 May 8.