1. The Second Department of General Surgery the First Hospital of Lanzhou University, Institute of Hepatopancreatobiliary Surgery of Gansu Lanzhou P. R. China
2. Key Laboratory of Biotherapy and Regenerative Medicine of Gansu Province Lanzhou P. R. China
3. Northwest Minzu University Lanzhou P. R. China
4. University of South China Hengyang P. R. China