1. Department of Obstetrics and Gynecology The Third Affiliated Hospital of Guangzhou Medical University Guangzhou City, Guangdong Province China
2. Department of Obstetrics and Gynecology Peking University First Hospital Beijing China
3. Department of Neonatology Children's Hospital Affiliated of Fudan University Shanghai China
4. Department of Obstetrics International Peace Maternity and Child Health Hospital Shanghai Jiao Tong University School of Medicine Shanghai China
5. Department of Obstetrics and Gynecology Shanghai First Maternity and Infant Hospital Shanghai China
6. Department of Obstetrics and Gynecology Renmin Hospital of Wuhan University Wuhan Hubei Province China
7. Department of Obstetrics and Gynecology Peking University Shenzhen Hospital Shenzhen Guangdong Province China
8. Department of Perinatal Medicine Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan Hubei Province China
9. Department of Critical Care Unit the Third Affiliated Hospital of Guangzhou Medical University Guangzhou Guangdong Province China
10. Department of Obstetrics and Gynecology Women's Hospital Zhejiang University School of Medicine Hangzhou Hangzhou Zhejiang Province China
11. Department of Obstetrics and Gynecology Nanjing Drum Tower Hospital the Affiliated Hospital of Nanjing University Medical School Nanjing JiangSu Province China
12. Department of Pediatrics Peking University First Hospital Beijing China
13. Department of Critical Care Unit The First Affiliated Hospital of Guangzhou Medical University Guangzhou Guangdong Province China
14. Department of Obstetrics and Gynecology Zhongnan Hospital of Wuhan University Wuhan Hubei Province China
15. Department of Obstetrics, Obstetrics and Gynecology Hospital of Fudan University Shanghai China
16. Department of Obstetrics and Gynecology the First Affiliated Hospital of Xi'an Jiaotong University Xi'an Shanxi Province China
17. Department of Affective Disorder Brain Hospital Affiliated of Guangzhou Medical University Guangzhou Guangdong Province China
18. Department of Obstetrics and Gynecology Shengjing Hospital of China Medical University Shenyang , Liaoning Province China
19. Department of Obstetrics and Gynecology Chinese Academy of Medical Sciences & Peking Union Medical college Hospital Beijing China
20. Department of Obstetrics and Gynecology West China Second University Hospital Sichuan University Chengdu Sichuan Province China
21. Department of Infectious Diseases The Third Affiliated Hospital of Guangzhou Medical University Guangzhou Guangdong Province China
22. Department of Obstetrics and Gynecology You'an Hospital Capital Medical University Beijing China
23. Department of Pediatrics Peking University Third Hospital Beijing China
24. Department of Obstetrics and Gynecology The First Affiliated Hospital of Chongqing Medical University Chongqing China
25. Department of Obstetrics and Gynecology The First Affiliated Hospital of Harbin Medical University Harbin Helongjiang Province China
26. Department of Obstetrics and Gynecology Provincial Hospital Affiliated to Shandong University Shandong Province China
27. Department of Obstetrics and Gynecology The First Affiliated Hospital Sun Yat‐sen University Guangzhou Guangdong Province China
28. Department of Gynecology and Obstetrics Nanfang Hospital Southern Medical University Guangzhou Guangdong Province China
29. School of Health Education of Wuhan University Wuhan Hubei Province China
30. Department of Obstetrics and Gynecology The Second Affiliated Hospital of Hebei Medical University Hebei Province China
31. Department of Obstetrics Fujian Provincial Maternity and Children Hospital Fuzhou Fujian Province China
32. Department of Obstetrics and Gynecology Peking University Third Hospital Beijing China
33. Department of Neonatology Tianjin Central Hospital of Gynecology Obstetrics Tianjin China
34. Department of Infectious Diseases Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical School Nanjing Jiangsu Province China
35. Department of Obstetrics and Gynecology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan Hubei Province China
36. Department of Obstetrics and Gynecology Baylor College of Medicine Houston TX USA