1. Department of Pulmonary and Critical Care Medicine, Beijing An‑Zhen Hospital, Capital Medical University, Beijing 100029, P.R. China
2. Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China‑Japan Friendship Hospital, Capital Medical University, National Clinical Research Center for Respiratory Diseases, Beijing 100029, P.R. China
3. Department of Pulmonary and Critical Care Medicine, First Affiliated Hospital of Nanchang University, Nanchang 330006, P.R. China