1. Department of Respiratory Medicine, Children's Hospital of Chongqing Medical University, Chongqing, China.
2. National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, China.
3. Chongqing Key Laboratory of Pediatrics, Chongqing Engineering Research Center of Stem Cell Therapy, Chongqing, China.
4. Department of Clinical Molecular Medicine, Children's Hospital of Chongqing Medical University, Chongqing, China.