1. Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
2. Department of Gastroenterology and Hepatology, St. Olav’s University Hospital, Trondheim, Norway
3. Department of Health Management and Health Economics, University of Oslo, Oslo, Norway
4. Department of Gastroenterology, Oslo University Hospital, Oslo, Norway
5. Institute of Clinical Medicine, University of Oslo, Oslo, Norway