1. Ministry of Education – Shanghai Key Laboratory of Children’s Environmental Health School of Public Health Shanghai Jiao Tong University School of Medicine Shanghai China
2. UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction Department of Reproductive Health and Research World Health Organization (WHO) Geneva Switzerland
3. Obstetrics and Gynaecology Hospital of Fudan University Shanghai China
4. Dongguan City Maternal and Child Health Hospital Southern Medical University Guangdong China
5. Department of Obstetrics and Gynaecology The Second Hospital Affiliated to Shaanxi University of Chinese Medicine Shaanxi China
6. Department of Obstetrics The Maternal and Child Health Hospital of Xinxiang Henan China
7. Department of Obstetrics The Maternal and Child Health Hospital of Dalian Liaoning China
8. Department of Obstetrics and Gynaecology Southwest Medical University Sichuan China
9. Department of Obstetrics and Gynaecology The First Hospital Affiliated to Kunming Medical University Yunnan China
10. Department of Obstetrics Jiangsu Women and Child Health Hospital Jiangsu China
11. The First People’s Hospital of Zhaotong Kunming Medical University Yunnan China
12. Department of Obstetrics The Maternal and Child Health Hospital of Qujing Yunnan China
13. Suining Central Hospital Chongqing Medical University Sichuan China
14. Taizhou Hospital of Zhejiang Province Zhejiang China
15. Yangzhou Maternal and Child Care Service Centre Jiangsu China
16. Qingdao Chengyang People’s Hospital Shandong First Medical University Shandong China
17. Department of Obstetrics The Maternal and Child Health Hospital of Baoji Shaanxi China
18. Yanshi City People’s Hospital Henan China
19. Department of Obstetrics and Gynaecology Aviation Hospital of Beijing China Medical University Beijing China
20. Department of Obstetrics The Maternal and Child Health Hospital of Luohu District Shenzhen China
21. Yanan University Affiliated Hospital Shaanxi China
22. Haikou Hospital of the Maternal and Child Health Hainan China
23. The First People’s Hospital of Taizhou Wenzhou Medical University Zhejiang China
24. The Second Affiliated Hospital of Hebei North University Hebei China
25. Department of Obstetrics and Gynaecology The 174th Hospital of the Chinese People’s Liberation Army Xiamen University Fujian China
26. Puyang Maternal and Child Care Centres Henan China
27. Luzhou People’s Hospital Sichuan China
28. Affiliated Hospital of Jiangsu University Jiangsu China
29. The Second People’s Hospital of Tongxiang Zhejiang China
30. The Central Hospital of Shaoyang University of South China Hunan China
31. Affiliated Hospital of Zunyi Medical University Guizhou China
32. The First Affiliated Hospital of Anhui Medical University Anhui China
33. Department of Obstetrics The Maternal and Child Health Hospital of Cangzhou Hebei China
34. The Second People’s Hospital of Qingyuan City Guangdong China
35. Department of Obstetrics and Gynaecology Fujian Medical University Union Hospital Fujian Medical University Fujian China
36. The People’s Hospital of Pengzhou Sichuan China
37. Department of Obstetrics Eastern District of the Fourth Hospital of Hebei Medical University Hebei China
38. Ministry of Education – Shanghai Key Laboratory of Children’s Environmental Health Xinhua Hospital Shanghai Jiao Tong University School of Medicine Shanghai China
39. Department of Obstetrics and Gynaecology Xinhua Hospital Shanghai Jiao Tong University School of Medicine Shanghai China
40. Department of Social Medicine Ribeirao Preto Medical School University of Sao Paulo Ribeirao Preto São Paulo Brazil
41. Department of Obstetrics and Gynaecology The First Affiliated Hospital of Chongqing Medical University Chongqing China
42. Department of Obstetrics Shanghai First Maternity and Infant Hospital Tongji University School of Medicine Shanghai China