1. Department of Gastroenterology and Hepatology, St Olav’s Hospital – Trondheim University Hospital, Trondheim, Norway;
2. Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology (NTNU), Trondheim, Norway;
3. Department of Gastrointestinal Surgery, St Olav’s Hospital – Trondheim University Hospital, Trondheim, Norway;
4. Department of Pathology, St Olav’s Hospital – Trondheim University Hospital, Trondheim, Norway