1. Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chaoyang Hospital, Capital Medical University, 8 Gongti Nanlu, Chaoyang District, Beijing 100020, China
2. Department of Internal Medicine, Beijing Institute of Respiratory Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
3. Medical Research Center, Beijing Institute of Respiratory Diseases, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China