Yi Lv1,2, Yuan Shi3. 1. Department of Hepatobiliary Surgery, Institute of Advanced Surgical Technology and Engineering, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China. 2. National Local Joint Engineering Research Center for Precision Surgery & Regenerative Medicine, Xi'an 710061, China. 3. Organ Transplantation Center, Tianjin First Center Hospital, Tianjin 300190, China.