1. Department of Pancreatic and Biliary Surgery, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
2. Department of Bioengineering, College of Life Science, North China University of Science and Technology, Tangshan, Hebei 063000, P.R. China
3. Department of Pathophysiology, Basic Medical College, China Medical University, Shenyang, Liaoning 110001, P.R. China