1. Section for Rheumatology, Department for Neurology, Rheumatology and Physical Medicine, Helse Førde , Førde, Norway
2. Center for treatment of Rheumatic and Musculoskeletal Diseases (REMEDY), Diakonhjemmet Hospital , Oslo, Norway
3. Department of Rheumatology, University Hospital of Northern Norway , Tromsø, Norway
4. Lillehammer Hospital for Rheumatic Diseases , Lillehammer, Norway
5. Department of Rheumatology, St. Olavs Hospital , Trondheim, Norway
6. Department of Neuromedicine and Movement Science, NTNU—Norwegian University of Science and Technology , Trondheim, Norway
7. Department of Rheumatology, Vestre Viken/Drammen Hospital , Drammen, Norway
8. Faculty of Medicine, University of Oslo , Oslo, Norway