Ye Feng Lu1, Kang He1, Bi Jun Qiu1, Yan Yang2, Ping Wan1, Qiang Xia1. 1. Department of Liver Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China. 2. Nursing Department, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.