Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Wuhan University - Department of Gastrointestinal Surgery II, Sichuan University - Department of Respiratory & Critical Care Medicine, The Public Health Clinical Centre of Chengdu - Department of Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Integrated Traditional Chinese and Western Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Dazhou Central Hospital - Department of Respiratory Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Sichuan University - Department of Respiratory & Critical Care Medicine, Southwest Medical University - Department of Critical Care Medicine, Mianyang 404 Hospital, University of Electronic Science and Technology of China (UESTC) - Department of Critical Care Medicine, People's Hospital of Ganzi Prefecture - Department of Respiratory and Critical Care Medicine, Nanchong Central Hospital - Department of Critical Care Medicine, Wuhan Xiehe Hospital - Department of Neurology, Wuhan University - Department of Gastrointestinal Surgery II, Sichuan University - Department of Respiratory & Critical Care Medicine and Sichuan University - Department of Respiratory & Critical Care Medicine