1. Department of Gynecology and Obstetrics, Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
2. Department of Gynecology and Obstetrics, Yangpu Hospital, Tongji University School of Medicine, Shanghai 200090, P.R. China
3. Department of Oncology, Shanghai Pudong Hospital, Fudan University, Shanghai 201399, P.R. China