1. Department of Liver Surgery, West China Hospital of Sichuan University, Chengdu, China
2. Thyroid and Parathyroid Surgery Center, West China Hospital of Sichuan University, Chengdu, China
3. Present address: Liver Surgery, West China Hospital of Sichuan University, Chengdu, China
4. Department of Pathology, West China Hospital of Sichuan University, Chengdu, China
5. West China School of Medicine, Sichuan University, Chengdu, China
6. Transplantation Center,West China Hospital of Sichuan University, Chengdu, China