1. Department of Gynecology, The Second Affiliated Hospital of Zhejiang University, Hangzhou, Zhejiang 310009, P.R. China
2. Department of Oncology, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
3. Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
4. Department of Pathology, The College of Basic Medicine Science and The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China