1. Department of Respiratory Medicine, Shijingshan Teaching Hospital of Capital Medical University, Beijing Shijingshan Hospital, Beijing 100043, P.R. China
2. Department of Psychology, Beijing Chao‑Yang Hospital, Capital Medical University, Beijing 100029, P.R. China
3. Department of Respiratory Medicine, Beijing Chao‑Yang Hospital, Capital Medical University, Beijing 100029, P.R. China
4. Center of Respiratory Medicine, China‑Japan Friendship Hospital, National Clinical Research Center for Respiratory Diseases, Peking University Health Science Center, Beijing 100029, P.R. China