1. Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China
2. Department of Clinical Medicine, Shanghai Medical College, Fudan University, Shanghai 200433, P.R. China
3. Department of Pathology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, P.R. China
4. Department of Pathology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China