van Lonkhuijzen Luc, van Roosmalen Jos, Zeeman Gerda
Department of Gynecology and Obstetrics, Groningen University Medical Center, Groningen, The Netherlands.
Int J Gynaecol Obstet. 2011 Mar;112(3):249. doi: 10.1016/j.ijgo.2010.11.004. Epub 2011 Jan 17.