Jiong-Jie Yu1, Ju-Dong Li1, Xin-Fei Xu1, Tian Yang2. 1. Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai, 200438, China; Department of Clinical Medicine, Second Military Medical University, Shanghai, 200433, China. 2. Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai, 200438, China. Electronic address: yangtianehbh@smmu.edu.cn.