1. Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
2. Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Centre of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
3. West China Hospital, Sichuan University, Chengdu 610041, P. R. China