1. Department of Epidemiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China
2. Department of Obstetrics and Gynecology Beijing Tongren Hospital Beijing China
3. Department of Pathology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China
4. RTI (Research Triangle Institute) International New Delhi India
5. Screening Group, Early Detection and Prevention Section International Agency for Research on Cancer Lyon France