1. Department of Hepatobiliary Surgery, Guilin Medical University, Affiliated Hospital, Guilin, Guangxi 541001, P.R. China
2. Department of Pathology, the Affiliated Hospital, Guilin Medical University, Guilin, Guangxi 541001, P.R. China
3. Department of Pathology and Physiopathology, Guilin Medical University, Guilin, Guangxi 541004, P.R. China
4. Department of Oral Molecular Pathology, Institute of Health Biosciences, University of Tokushima Graduate School, Tokushima 770-8504, Japan