1. Department of Respiratory Disease, Beijing Children's Hospital, Capital Medical University, Beijing, China
2. Department of Respiratory Disease, Children's Hospital Affiliated with Capital Institute of Pediatrics, Beijing, China
3. Department of Respiratory Disease, Shenzhen Children's Hospital, Shenzhen, China
4. Department of Respiratory Disease, West China Second University Hospital, Chengdu, China
5. Department of Pediatrics, Shanghai General Hospital, Shanghai, China
6. Department of Pediatrics Respiratory Disease, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
7. Department of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
8. Department of Respiratory Disease, Guangzhou Women and Children's Medical Center, Guangzhou, China
9. Department of Respiratory Disease, Children's Hospital of Soochow University, Suzhou, China
10. Guangzhou Institute of Respiratory Disease, Guangzhou, China