1. Department of Surgery; The Norwegian Radium Hospital; Oslo University Hospital; Institute for Clinical Medicine; Faculty of Medicine; University of Oslo; Oslo Norway
2. Department of Oncology; Anyang Tumor Hospital; Anyang Henan Province China
3. Department of Surgery; Anyang Tumor Hospital; Anyang Henan Province China
4. Department of Pathology; Anyang Tumor Hospital; Anyang Henan Province China
5. Department of Pathology; The Norwegian Radium Hospital; Oslo University Hospital; Institute for Clinical Medicine; Faculty of Medicine; University of Oslo; Oslo Norway