C Pan1, W Zhang2, B Du3, H B Qiu1, Y Z Huang1. 1. Department of Critical Care Medicine, Zhongda Hospital, Southeast University, Nanjing 210009, China. 2. Department of Emergency,the 900th Hospital of Joint Service Corps of Chinese PLA, Fuzhou 350025, China. 3. Department of Medical Intensive Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China.