1. Department of Hepatobiliary Surgery, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, Jiangsu 210008, P.R. China
2. Department of General Surgery, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Clinical College of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210008, P.R. China
3. Hepatobiliary Institute, Medical School, Nanjing University, Nanjing, Jiangsu 210008, P.R. China