1. Department of Obstetrics and Gynecology, the Second Hospital of Shandong University, Jinan, PR, China
2. Division of Gynecologic Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
3. Department of Gynecologic Oncology, Beijing Obstetrics and Gynecology Hospital, Capital MedicalUniversity, Beijing Maternal and Child Health Care Hospital, Beijing, China
4. Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA