1. Department of Clinical Laboratory, Guigang City People's Hospital, Guigang, Guangxi 537100, P.R. China
2. Department of Pathology, Guigang City People's Hospital, Guigang, Guangxi 537100, P.R. China
3. Department of Hepatobiliary Surgery, Guigang City People's Hospital, Guigang, Guangxi 537100, P.R. China
4. Department of Clinical Laboratory, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China