Tao Li1, Xiao-Yun Yang2, Zhao-You Tang3. 1. Department of General Surgery, Qilu Hospital, Shandong University, Jinan, P.R. China. Electronic address: litao7706@163.com. 2. Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, P.R. China. 3. Liver Cancer Institute and Zhongshan Hospital, Fudan University, Key Laboratory for Carcinogenesis & Cancer Invasion, the Chinese Ministry of Education, Shanghai, P. R. China.