1. School of Basic Medical Science, Chongqing Medical University, Chongqing 400016, P. R. China
2. Department of Hepatobiliary Surgery, Chongqing Medical University, Chongqing 400016, P. R. China
3. Department of Pathology, Chongqing Medical University, Chongqing 400016, P. R. China
4. Molecular Medicine Diagnostic and Testing Center, Chongqing Medical University, Chongqing 400016, P. R. China
5. Department of Pathology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P. R. China