1. Department of Hepatobiliary Surgery, Affiliate Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, Jiangsu Province, P.R. China
2. Department of General Surgery, Nanjing Drum Tower Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Graduate School of Peking Union Medical College Nanjing, Nanjing 210008, Jiangsu Province, P.R. China
3. Department of Hepatobiliary Surgery, Nanjing Medical University Nanjing, Nanjing 211166, Jiangsu Province, P.R. China