1. Department of Cancer EpidemiologyNational Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing China
2. School of Public Health, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing China
3. Department of Women's Health CareBeijing Obstetrics and Gynecology Hospital, Capital Medical University Beijing Maternal and Child Health Care HospitalBeijing China
4. School of Humanities and Social Sciences, Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing China