1. Department of Hepatobiliary Surgery, The First Affiliated Hospital of Kangda College of Nanjing Medical University, Lianyungang, Jiangsu 222001, P.R. China
2. Department of Hepatobiliary Surgery, Affiliated Lianyungang Hospital of Xuzhou Medical University, Lianyungang, Jiangsu 222001, P.R. China
3. Department of Hepatobiliary and Pancreatic Surgery, Fujian Provincial Hospital, Fuzhou, Fujian 350001, P.R. China
4. Department of Pathology, The Second People's Hospital of Lianyungang, Lianyungang, Jiangsu 222001, P.R. China