1. West China School of Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
2. Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
3. Department of Respiratory and Critical Care Medicine, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, China
4. Department of Respiratory and Critical Care Medicine, People's Hospital of Leshan, Leshan, Sichuan Province, China
5. Department of Respiratory and Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
6. Department of Respiratory and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
7. State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou, Guangdong Province, China
8. Department of Respiratory and Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, Hunan Province, China