1. National Clinical Research Center of Respiratory Diseases, Center for Respiratory Diseases, China－Japan Friendship HospitalCapital Medical University Beijing 100029 China
2. Department of Respiratory and Critical Care Medicine, Changhai Hospitalthe Second Military Medical University Shanghai 200433 China
3. Department of Respiratory and Critical Care MedicineChinese PLA General Hospital Beijing 100853 China
4. Department of Respiratory and Critical Care Medicine, Ruijin Hospital, School of MedicineShanghai Jiaotong University Shanghai 200025 China
5. Department of Respiratory and Critical Care Medicine, West China HospitalSichuan University Sichuan 610041 China
6. Department of Pulmonary MedicinePeking Union Medical College Hospital Beijing 100730 China
7. Department of Respiratory and Critical Care Medicine, Shanghai Pulmonary HospitalTongji University School of Medicine Shanghai 200433 China
8. Department of Respiratory and Critical Care Medicine, Zhongshan HospitalFudan University Shanghai 200032 China
9. Department of Respiratory and Critical Care Medicine, Shengjing HospitalChina Medical University Shenyang 110004 China
10. Department of Respiratory MedicinePeking University Third Hospital Beijing 100191 China
11. Department of Laboratory MedicinePeking University People's Hospital Beijing 100044 China
12. State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Diseasesthe First Affiliated Hospital of Guangzhou Medical University Guangzhou 510120 China
13. Department of Respiratory and Critical Care MedicineGuizhou Provincial People's Hospital Guizhou 550002 China
14. Department of Respiratory and Critical Care MedicineJinling Hospital Nanjing 210002 China