1. Department of Hepatobiliary Surgery, Hospital of Hunan Normal University Changsha, Hunan 410005, P. R. China
2. Hunan Research Center of Biliary Disease, Hospital of Hunan Normal University Changsha, Hunan 410005, P. R. China
3. Central Laboratory Hunan Provincial, People’s Hospital/The First Affiliated, Hospital of Hunan Normal University Changsha, Hunan 410005, P. R. China
4. Department of Oncology, Changsha, Central Hospital, Changsha, Hunan 410018, P. R. China
5. Department of General Surgery, Shaoyang Central Hospital, Shaoyang, Hunan 422000, P. R. China