Han Xiaoyan, Leng Jinhua, Guo Lina, Xiang Yang, Lang Jinghe
Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China.
Aust N Z J Obstet Gynaecol. 2010 Dec;50(6):574-6. doi: 10.1111/j.1479-828X.2010.01213.x. Epub 2010 Sep 1.