1. Division of Rheumatology and Research, Diakonhjemmet Hospital, Oslo, Norway
2. Department of Gastroenterology, Akershus University Hospital, Lørenskog, Norway
3. Section of Dermatology, Oslo University Hospital, Oslo, Norway
4. Department of Research Support for Clinical Trials, Oslo University Hospital, Oslo, Norway
5. Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
6. Faculty of Medicine, University of Oslo, Oslo, Norway
7. Department of Gastroenterology, Stavanger University Hospital, Stavanger, Norway
8. Department of Gastroenterology, Hospital of Southern Norway Trust, Arendal, Norway
9. Department of Rheumatology, Betanien Hospital, Skien, Norway
10. Department of Rheumatology, Ålesund Hospital, Ålesund, Norway
11. Department of Rheumatology, Østfold Hospital Trust, Moss, Norway
12. Department of Rheumatology, Nordland Hospital Trust, Bodø, Norway
13. Department of Rheumatology, University Hospital of North Norway, Tromsø, Norway
14. Departement of Gastroenterology, Vestfold Hospital Trust, Tønsberg, Norway
15. Division of Rheumatology, Department of Medicine, Hospital of Southern Norway Trust, Kristiansand, Norway
16. Lillehammer Hospital for Rheumatic Diseases, Lillehammer, Norway
17. Haugesund Hospital for Rheumatic Diseases, Haugesund, Norway
18. Department of Gastroenterology, Fonna Hospital Trust, Haugesund, Norway
19. Department of Rheumatology, Vestre Viken Hospital Trust, Drammen, Norway
20. Department of Dermatology, St Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
21. Department of Dermatology, Haukeland University Hospital, Bergen, Norway
22. Department of Medicine, Innlandet Hospital Trust, Elverum, Norway
23. Department of Medicine, Innlandet Hospital Trust, Hamar, Norway
24. Department of Neurology, Rheumatology, and Physical Medicine, Førde Hospital Trust, Førde, Norway
25. Akershus Dermatology Center, Lørenskog, Norway