1. Department of Respiratory and Critical Care Medicine, Beijing Key Laboratory of Respiratory and Pulmonary Circulation Disorders, Beijing Chao-Yang Hospital-Beijing Institute of Respiratory Medicine, Capital Medical University, Beijing 100020, P.R. China
2. Department of Medical Research, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020, P.R. China
3. National Clinical Research Centre for Respiratory Medicine, Beijing Hospital, Beijing 100730, P.R. China