1. Respiratory Department II, National Clinical Research Center for Respiratory Diseases, Beijing Children’s Hospital Capital Medical University, National Center for Children’s Health Beijing, China
2. Respiratory Department, Children’s Hospital Affiliated to Zhengzhou University Henan Children’s Hospital, Zhengzhou Children’s Hospital Zhengzhou, China
3. Pathology Department, National Clinical Research Center for Respiratory Diseases, Beijing Children’s Hospital Capital Medical University, National Center for Children’s Health Beijing, China