1. Department of Anesthesiology and Intensive Care, Changhai Hospital, Second Military Medical University, Shanghai 200433, P.R. China
2. Department of Hepatic Surgery IV, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, P.R. China
3. Department of Anesthesiology and SICU, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200092, P.R. China