1. Guangdong Provincial Key Laboratory of Major Obstetric Diseases; Guangdong Provincial Clinical Research Center for Obstetrics and Gynecology; Guangdong-Hong Kong-Macao Greater Bay Area Higher Educatio
2. The Third Affiliated Hospital of Guangzhou Medical University
3. Peking University Third Hospital
4. Sichuan jinxin xinan women & children's hospital
5. The Affiliated Hospital of Guizhou Medical University
6. Xiamen Maternal and Child Health Care Hospital
7. Affiliated Dongguan Shilong People's Hospital of Southern Medical University
8. First Affiliated Hospital of Shaoyang University
9. Guangdong Second Provincial General Hospital
10. Cangzhou People's Hospital
11. Yanan University Affiliated Hospital
12. Huizhou Central People’s Hospital
13. The Affiliated Yue Bei People's Hospital of Shantou University Medical College
14. Xiaogan Hospital Affiliated to Wuhan University of Science and Technology
15. The Affiliated Hospital of Inner Mongolia Medical University
16. The Second Affiliated Hospital of Shantou University Medical College
17. The Third Staff Hospital of Baogang Group Baotou
18. Jinan University First Affiliated Hospital
19. Lanzhou University Second Hospital
20. Xinxiang Central Hospital
21. Zhongshan City People's Hospital
22. Binhaiwan Central Hospital of Dongguan
23. The First Affiliated Hospital of Shantou University Medical College