1. Department of Gynecology, Cancer Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
2. Department of Gynecology, The First People's Hospital of Jining, Jining, Shandong 272000, P.R. China
3. Department of Gynecology, The Second Affiliated Hospital of Tsinghua University, Beijing 100049, P.R. China
4. Department of Gynecology, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
5. Department of Gynecology, Shanghai General Hospital, Shanghai 200080, P.R. China
6. Department of Gynecology, Peking University First Hospital, Beijing 100034, P.R. China
7. Department of Gynecology, Women's Hospital School of Medicine Zhejiang University, Hangzhou, Zhejiang 310006, P.R. China
8. Department of Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
9. Department of Gynecology, Daping Hospital, Research Institute of Surgery Third Military Medical University, Chongqing 400042, P.R. China
10. Department of Gynecology, Jiangsu Cancer Hospital, Nanjing, Jiangsu 210009, P.R. China
11. Department of Gynecology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
12. Department of Gynecology, Peking University People's Hospital, Beijing 100044, P.R. China
13. Department of Gynecology, Chongqing Cancer Hospital, Chongqing 400030, P.R. China
14. Department of Gynecology, Cancer Hospital, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China
15. Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China