1. 1Department of Gynecology, The Third Affiliated Hospital of Kunming Medical University/Yunnan Cancer Hospital/Yunnan Cancer Center, Kunming, Yunnan, China.
2. 2Department of Cancer Epidemiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
3. 3School of Public Health, Dalian University, Dalian, Liaoning, China.
4. 4Department of Quality Management, Dalian No.3 People's Hospital, Dalian, Liaoning, China.