1. Department of Respiratory and Critical Care Medicine, The Affiliated Jiangning Hospital of Nanjing Medical University, Nanjing, Jiangsu 210002, P.R. China
2. ICU, The Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, P.R. China
3. Emergency Department, The Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, P.R. China