1. Key Laboratory of Major Diseases in Children, Ministry of Education, Department of Infectious Diseases, National Center for Children’s Health, Beijing Children’s Hospital, Capital Medical University, Beijing, People’s Republic of China
2. Department of Infectious and Digestive Diseases, Qinghai Province Women and Children's Hospital, Xining, People’s Republic of China
3. Department of Infectious Diseases, Hunan Children’s Hospital, Changsha, People’s Republic of China
4. Department of Infectious Diseases, Henan Children’s Hospital, (Children's Hospital Affiliated of Zhengzhou University, Zhengzhou Children's Hospital), Zhengzhou, People’s Republic of China
5. Department of Infectious Diseases, Shenzhen Children’s Hospital, Shenzhen, People’s Republic of China
6. Department of Infectious and Digestive Diseases, Children’s Hospital of Hebei Province, Shijiazhuang, People’s Republic of China
7. Department of Infectious Diseases, Children’s Hospital of Nanjing Medical University, Nanjing, People’s Republic of China
8. Department of Infectious Diseases, Dalian Children’s Hospital, Dalian, People’s Republic of China
9. Department of Infectious Diseases, Children’s Hospital Affiliated to Shandong University, Jinan, People’s Republic of China
10. Jinan Children’s Hospital, Shandong University, Jinan, People’s Republic of China
11. Department of Infectious Diseases, Baoding Children’s Hospital, Baoding, People’s Republic of China
12. Department of Infectious Diseases, Hangzhou Children’s Hospital, Hangzhou, People’s Republic of China
13. Department of Infectious Diseases, Xian Children’s Hospital, Xian, People’s Republic of China
14. Department of Infectious Diseases, Children’s Hospital of Jiangxi Province, Nanchang, People’s Republic of China
15. Department of Infectious Diseases, Changchun Children’s Hospital, Changchun, People’s Republic of China
16. Department of Infectious Diseases, Urumqi Children’s Hospital, Urumqi, People’s Republic of China
17. Department of Pediatric Intensive Care Unit, People’s Hospital of Liaocheng, Liaocheng, People’s Republic of China
18. Department of Infectious Diseases, Children’s Hospital of Shanxi Province, Taiyuan, People’s Republic of China
19. Department of Infectious Diseases, Maternal and Child Health Care Hospital of the Inner Mongolia autonomous region, Huhehaote, People’s Republic of China
20. Department of Infectious Diseases, Anhui Provincial Children’s Hospital, Hefei, People’s Republic of China
21. Department of clinical laboratory, Qinghai Province Women and Children's Hospital, Xining, People’s Republic of China
22. Department of clinic laboratory, Hunan Children’s Hospital, Changsha, People’s Republic of China
23. Key Laboratory of Major Diseases in Children, Ministry of Education, National Key Discipline of Pediatrics (Capital Medical University), Beijing Pediatric Research Institute, Beijing Children’s Hospital, National Center for Children’s Health, Capital Medical University, Beijing, People’s Republic of China