1 Department of Respiratory Medicine, Beijing Children's Hospital, Capital Medical University; National Center for Children's Health; Beijing, China.
2 Department of Pathology, Beijing Children's Hospital, Capital Medical University; National Center for Children's Health, Beijing, China.
3 Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute, MOE Key Laboratory of Major Diseases in Children, Genetics and Birth Defects Control Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China.
4 Department of Otolaryngology Head and Neck Surgery, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China.