1. HUNT Research Centre, Department of Public Health and Nursing NTNU, Norwegian University of Science and Technology Levanger Norway
2. Department of Medicine Levanger Hospital, Nord‐Trøndelag Hospital Trust Levanger Norway
3. Upper Gastrointestinal Surgery, Department of Molecular Medicine and Surgery Karolinska Institutet, Karolinska University Hospital Stockholm Sweden
4. Department of Gastrointestinal Surgery St. Olav's Hospital, Trondheim University Hospital Trondheim Norway
5. Department of Clinical and Molecular Medicine NTNU, Norwegian University of Science and Technology Trondheim Norway
6. Department of Pathology, St. Olav's Hospital Trondheim University Hospital Trondheim Norway
7. School of Cancer and Pharmaceutical Sciences King's College London London UK
8. Department of Gastroenterology and Hepatology St. Olav's Hospital, Trondheim University Hospital Trondheim Norway