1. Department of Respiratory and Critical Care Medicine, West China Hospital, West China School of Medicine, and Division of Pulmonary Diseases, State Key Laboratory of Biotherapy, Sichuan University, Chengdu, Sichuan, China
2. Department of Respiratory and Critical Care Medicine, Sixth People’s Hospital of Chengdu, Chengdu, Sichuan, China
3. Department of Respiratory and Critical Care Medicine, The General Hospital of Western Theatre Command, Chengdu, Sichuan, China