1. Department of Liver Surgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R.China
2. Department of Pathology, Youjiang Medical University for Nationalities, Baise 533000, P.R.China
3. Department of Medicine, The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, P.R.China
4. Department of Tumor, The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, P.R.China
5. Department of Pathology, The Affiliated Tumor Hospital of Guangxi Medical University, Nanning 530021, P.R.China