1. First Central Clinical College of Tianjin Medical University, Tianjin 300192, P.R. China
2. Transplantation Center, Tianjin First Center Hospital, Tianjin 300192, P.R. China
3. Department of General Surgery, Tianjin First Center Hospital, Tianjin 300192, P.R. China
4. Department of Radiology, Tianjin First Center Hospital, Tianjin 300192, P.R. China