1. Department of Respiratory Center Children's Hospital of Chongqing Medical University National Clinical Research Center for Child Health and Disorders Ministry of Education Key Laboratory of Child Development and Disorders Chongqing Key Laboratory of Child Infection and Immunity Chongqing China
2. Yichun People's Hospital Yichun Jiangxi China
3. Tianjin Children's Hospital Tianjin China
4. General Hospital of Ningxia Medical University Yinchuan Ningxia China
5. The Second Hospital of Tianjin Medical University Tianjin China
6. Shanghai Children’s Hospital School of Medicine, Shanghai Jiao Tong University Shanghai China
7. Baotou City Central Hospital Baotou, Inner Mongolia China
8. Children's Hospital of Soochow University Suzhou Jiangsu China
9. The Affiliated Hospital of Qingdao University Qingdao Shandong China
10. Xiangya Hospital Central South University Changsha Hunan China
11. Ganzhou Women and Children's Health Care Hospital Guangzhou Guangdong China
12. The Third Affiliated Hospital Sun Yat‐sen University Guangzhou Guangdong China
13. Xiamen Medical College Affiliated Haicang Hospital Xiamen Fujian China
14. Zhongshan Hospital Xiamen University Xiamen Fujian China
15. Xiamen Children's Hospital Xiamen Fujian China
16. Children's Hospital of Nanjing Medical University Nanjing Jiangsu China
17. Children's Hospital of Zhejiang University School of Medicine Hangzhou Zhejiang China
18. Shenzhen Children's Hospital Shenzhen Guangdong China
19. Quanzhou Children's Hospital of Fujian Province Quanzhou Fujian China
20. Shanghai Children's Medical Center Shanghai China
21. The First Affiliated Hospital of Fujian Medical University Fuzhou Fujian China
22. Dongfang Hospital Beijing University of Chinese Medicine Beijing China
23. Shanghai Tenth People's Hospital Shanghai China
24. The First Affiliated Hospital of Xiamen University Xiamen Fujian China
25. Women and Children's Hospital School of Medicine, Xiamen University Xiamen China
26. The First People's Hospital of Foshan Foshan Guangdong China
27. Chengdu Women's and Children's Central Hospital Chengdu Sichuan China
28. Xi'an Children's Hospital Xi'an Shanxi China
29. Fujian Provincial Maternal and Child Health Care Hospital Fuzhou Fujian China
30. The Second Affiliated Hospital of Wenzhou Medical University Wenzhou Zhejiang China
31. West China Second University Hospital Sichuan University Chengdu Sichuan China
32. Guangzhou First People's Hospital Guangzhou Guangdong China
33. Shanghai General Hospital Shanghai China
34. Children's Hospital of Shanxi Taiyuan Shanxi China
35. Chongqing University Three Gorges Hospital Chongqing China
36. The First Hospital of Jilin University Changchun Jilin China
37. The Second Affiliated Hospital of Harbin Medical University Harbin Heilongjiang China