1. Medical Research Center, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
2. Department of Epidemiology and Statistics, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing, China
3. Department of Gynecology and Obstetrics, Children’s Hospital of Shanxi Province, Shanxi, China
4. Department of Gynecology and Obstetrics, Maternal and Child Health Hospital of Wuxi, Jiangsu, China
5. Department of Gynecology and Obstetrics, Maternal and Child Health Hospital of Gansu Province, Lanzhou, China
6. Department of Gynecology and Obstetrics, Maternal and Child Health Hospital of Foshan, Guangdong, China
7. Department of Gynecology and Obstetrics, Maternal and Child Health Hospital of Guiyang, Guizhou, China
8. Department of Gynecology and Obstetrics, Sheng Jing Hospital of China Medical University, Liaoning, China
9. Department of Gynecology and Obstetrics, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Clinical Research Center for Obstetric and Gynecologic Diseases, Beijing, China