1. Faculty of Health, Welfare and Organisation, Østfold University College, Halden, Norway
2. Department of Gastroenterology, Østfold Hospital Trust, Grålum, Norway
3. Department of Gastroenterology, Oslo University Hospital, Nydalen, Norway
4. Institute of Clinical Medicine, University of Oslo, Blindern, Norway
5. Department of Gastroenterology, Stavanger University Hospital, Stavanger, Norway
6. Department of Clinical Science, University of Bergen, Bergen, Norway
7. Department of Gastroenterology, Akershus University Hospital, Lillestrøm, Norway
8. Department of Gastroenterology, Innlandet Hospital Trust, Gjøvik, Norway
9. Department of Medicine, VestreViken Baerum Hospital, Gjettum, Norway
10. Vestfold Hospital Trust, Tønsberg, Norway