1. Department of Gastrointestinal Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, P.R. China
2. Jiangxi Institute of Digestive surgery, Nanchang, Jiangxi 330006, P.R. China
3. Department of General Surgery, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu, P.R. China