Zhu Xiao-he, Ou-Yang Ling, Li Bo, Ma Ning-ye
Department of gynecology & obstetrics, The Shenjing Affiliated Hospital of China Medical University, Shenyang, China.
Zhejiang Da Xue Xue Bao Yi Xue Ban. 2010 Jan;39(1):109-10. doi: 10.3785/j.issn.1008-9292.2010.01.019.