1. Department of Gastroenterology and Hepatology, St Olavs Hospital, Trondheim, Norway
2. Department of Cancer Research and Molecular Medicine, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway
3. Department of Surgery, St Olavs Hospital, Trondheim, Norway
4. Department of Pathology, St Olavs Hospital, Trondheim, Norway
5. Department of Laboratory Medicine, Children's and Women's Health, Norwegian University of Science and Technology, Trondheim, Norway