1. Department of Gastroenterology, Division of Medicine, Akershus University Hospital, Lørenskog, Norway
2. Institute of Clinical Medicine, University of Oslo, Oslo, Norway
3. Department of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
4. Department of Internal Medicine, Ersta Hospital, Stockholm, Sweden
5. Genetic Analysis AS, Oslo, Norway
6. Department of Clinical Molecular Biology (EpiGen), Division of Medicine, Akershus University Hospital, Lørenskog, Norway
7. Health Services Research Unit, Akershus University Hospital, Lørenskog, Norway
8. Department of Pediatric and Adolescent Medicine, Akershus University Hospital, Lørenskog, Norway
9. Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden
10. Digestive Diseases Unit, IIS Aragón, Zaragoza, Spain
11. Gastrointestinal Unit, Centre for Genomics and Molecular Medicine, Division of Medical and Radiological Sciences, University of Edinburgh, Edinburgh, UK
12. Translational Gastroenterology Unit, Medical Sciences/Experimental Medicine Division, University of Oxford, Oxford, UK