1. State Key Laboratory of Oncogenes and Related Genes Stem Cell Research Center Shanghai Cancer Institute Ren Ji Hospital Shanghai Jiao Tong University School of Medicine 160 Pujian Rd Shanghai 200127 P. R. China
2. Department of Biliary‐Pancreatic Surgery Ren Ji Hospital Shanghai Jiao Tong University School of Medicine 160 Pujian Rd Shanghai 200127 P. R. China
3. Department of Radiology Ren Ji Hospital Shanghai Jiao Tong University School of Medicine 160 Pujian Rd Shanghai 200127 P. R. China