1. Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China
2. Hunan Provincial Clinical Research Center for Critical Care Medicine, Changsha, Hunan, China
3. National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Xiangya Hospital, Central South University, Changsha, Hunan, China
4. School of Computer Science and Engineering, Central South University, Changsha, Hunan, China
5. Respiratory and Critical Care Medicine Department, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China
6. Xiangya Hospital, Central South University, Changsha, Hunan, China
7. Department of Radiology, Ruijin Hospital Luwan Branch, School of Medicine, Shanghai Jiaotong University, Shanghai, China