1. Department of Respiratory Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
2. Department of Respiratory Medicine, Second Affiliated Hospital of Military Medical University, Chongqing, Sichuan, China
3. Department of Respiratory Medicine, People’s Liberation Army Joint Logistic Support Force 920th Hospital, Kunming, China
4. Department of Respiratory Diseases, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing, China