1. Department of Radiation Oncology, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shanxi, P.R. China
2. Second Clinical College of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, P.R. China
3. Department of Gynecologic Radiation Oncology, Zhejiang Cancer Hospital, Hangzhou, Zhejiang, P.R. China