1. The First Clinical Medical College, Lanzhou University, Lanzhou 730000, China
2. General Surgery Department, The First Hospital of Lanzhou University, Lanzhou 730000, China
3. Key Laboratory of Biotherapy and Regenerative Medicine of Gansu Province, Lanzhou 730000, China
4. Hepatopancreatobiliary Surgery Institute of Gansu Province, Lanzhou 730000, China