Wen-Tao Yan1, Bing Quan1, Hao Xing2, Meng-Chao Wu2, Tian Yang3. 1. Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China; Department of Clinical Medicine, Navy Medical University, Shanghai 200433, China. 2. Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China. 3. Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China. Electronic address: yangtianehbh@smmu.edu.cn.