1. Department of Gynecologic Oncology, Affiliated Tumor Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
2. Department of Gynecologic Oncology, Chongqing University Cancer Hospital and Chongqing Cancer Institute and Chongqing Cancer Hospital, Chongqing 400030, P.R. China
3. Department of Gynecology, The Second Affiliated Hospital, Guangxi Medical University, Nanning, Guangxi 530000, P.R. China