1. Department of Gastroenterology and Hepatology; St. Olav's Hospital; Trondheim Norway
2. Department of Cancer Research and Molecular Medicine; Faculty of Medicine; Norwegian University of Science and Technology; Trondheim Norway
3. Human Genetics Group; Spanish National Cancer Research Center (CNIO); Madrid Spain
4. Network of Research on Rare Diseases (CIBERER); Madrid Spain
5. Department of Pathology; St. Olav's Hospital; Trondheim Norway