Sun Xin, Xue Min, Xiao Songshu, Wan Yajun, Wang Binbin
Department of Gynecology and Obstetrics, Third Xiangya Hospital, Central South University, Changsha, Hunan, China.
Int J Gynaecol Obstet. 2010 Jun;109(3):247-8. doi: 10.1016/j.ijgo.2010.01.013. Epub 2010 Mar 2.