1. Department of General Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, P.R. China
2. Department of Hepatobiliary Surgery, The Fifth Affiliated Hospital of The Medical School of Nantong University, Taizhou, Jiangsu 225300, P.R. China
3. Department of General Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, P.R. China