1. Department of Hepatobiliary and Pancreatic Surgery, Clinical Medical College of Yangzhou University, Jiangsu, 225001, P.R. China
2. Liver Cancer Institute and Department of Liver Surgery of Zhongshan Hospital, Fudan University, Key Laboratory of Carcinogenesis and Cancer Invasion (Fudan University), Ministry of Education, Shanghai, 200032, P.R. China
3. Department of Digestion, The First People's Hospital of Yunnan Province, Yunnan, 650000, P.R. China