1. Department of Gastroenterology, Tongji Institute of Digestive Disease, Tongji Hospital, School of Medicine, Tongji University, Shanghai 200065, P.R. China
2. Department of Pathology, Tongji Hospital, School of Medicine, Tongji University, Shanghai 200065, P.R. China
3. Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University, Shanghai 200065, P.R. China
4. Department of Gastroenterology, Tongji Institute of Digestive Disease, Tongji Hospital, School of Medicine, Tongji University, Shanghai 200065, P.R. China
5. Department of General Surgery, Tongji Hospital, School of Medicine, Tongji University, Shanghai 200065, P.R. China