1. Department of Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University Medical College, Xi’an, Shannxi, P.R. China
2. Department of Gynecological Oncology, Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, P.R. China
3. Department of Oncology, The First Affiliated Hospital of Xi’an Jiaotong University Medical College, Xi’an, Shannxi, P.R. China
4. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Xi’an Jiaotong University Medical College, Xi’an, Shannxi, P.R. China
5. Department of Obstetrics and Gynecology, University of Kansas School of Medicine, Kansas City, Kansas, USA