Chinese Center for Disease Control and Prevention (China CDC), Peking University, affiliation not provided to SSRN, Chinese Center for Disease Control and Prevention (China CDC) - National Center for Chronic Non-Communicable Disease Control and Prevention and Chinese Centre for Disease Control and Prevention - National Centre for Non-Communicable Disease Control and Prevention

Peking University, Peking University, Sichuan University, Shandong University, Jiangxi Maternal and Child Health Hospital, China Medical University, Zhengzhou University - Department of Gynecology, Nanjing Medical University - Nanjing Medical Hospital, Xi'an Jiaotong University (XJTU), Capital Medical University - Beijing Chaoyang Hospital, Guizhou Provincial People's Hospital, Peking University, Nanjing University - The Affiliated Drum Tower Hospital, Chongqing Medical University, Hainan Provincial People's Hospital, Fudan University - Department of Obstetrics and Gynecology, Chongqing Tumor Research Institute, Beijing Tsinghua Changgeng Hospital, Peking University, Peking University, Peking University - Department of Obstetrics and Gynecology and Peking University - Department of Obstetrics and Gynecology