1. Department of Respiratory medicineYongzhou central Hospital Yongzhou China
2. Department of Respiratory EndoscopyShanghai Jiao Tong University Shanghai China
3. Department of Respiratory and Critical Care Medicine, Shanghai Chest HospitalShanghai Jiao Tong University Shanghai China
4. Shanghai Engineering Research Center of Respiratory Endoscopy Shanghai China
5. Institute of Respiratory DiseaseFirst Hospital of China Medical University Shenyang China