1. Department of Surgical Oncology, Lanzhou University Second Hospital, Lanzhou 730000, China
2. Key Laboratory of Digestive System Tumors of Gansu Province, Lanzhou University Second Hospital, Lanzhou 730000, China
3. Department of Hepatic Surgery, Liver Transplant Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
4. Department of Pathology, Lanzhou University Second Hospital, Lanzhou 730000, China