1. Department of Hepatopancreatobiliary Surgery, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350004, P.R. China
2. Department of Pathology, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350004, P.R. China
3. Institute of Abdominal Surgery, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350004, P.R. China