1. Department of Gastroenterology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, P.R. China;
2. Department of Surgery, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, P.R. China;
3. Department of Pathology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, P.R. China;
4. Division of Gastroenterology and Department of Internal Medicine, Veterans Affairs Medical Center, Karmanos Cancer Institute, School of Medicine, Wayne State University, Detroit, MI, USA;
5. Department of Surgery, Jingan Branch of Huashan Hospital, Fudan University, Shanghai, P.R. China