1. Department of Cancer Research and Molecular Medicine; Norwegian University of Science and Technology; Trondheim Norway
2. Department of Surgery; St Olavs Hospital; Trondheim University Hospital; Trondheim Norway
3. Division of Colorectal Surgery; The University of Hong Kong; Queen Mary Hospital; Hong Kong
4. Digestive Disease Institute; Cleveland Clinic; Cleveland Ohio USA
5. Department of Colorectal Surgery; Cleveland Clinic; Cleveland Ohio USA
6. Division of Colorectal Surgery; University Hospitals Case Medical Center; Cleveland Ohio USA
7. Case Western Reserve University; Cleveland Ohio USA