1. Department of Academic Surgery, Leeds Institute of Biological and Clinical Sciences, University of Leeds, Leeds, United Kingdom
2. Department of Surgery, University of California, Irvine
3. Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, United Kingdom
4. Section of Pathology and Tumour Biology, Leeds Institute of Cancer and Pathology, University of Leeds, Leeds, United Kingdom
5. Division of Gastroenterology, Department of Surgery, Oulu University Hospital, Oulu, Finland
6. Aarhus Hospital, Aarhus, Denmark
7. Frimley Park Hospital, Frimley, United Kingdom
8. Ospedale Della Misericordia, Grosseto, Italy
9. School of Population Health, University of Auckland, Auckland, New Zealand
10. Academic Unit of Health Economics, University of Leeds, Leeds, United Kingdom