1. Division of Rheumatology and Research, Diakonhjemmet Hospital, Oslo, Norway
2. Clinical Trial Unit, Oslo University Hospital, Oslo, Norway
3. Department of Rheumatology, Ålesund Hospital, Helse Møre og Romsdal HF, Ålesund, Norway
4. Revmatismesykehuset AS, Lillehammer, Norway
5. Department of Rheumatology, Haukeland University Hospital, Bergen, Norway
6. Department of Rheumatology, Hospital Østfold HF, Moss, Norway
7. Department of Rheumatology, University Hospital of North Norway, Tromsø, Norway
8. Department of Rheumatology, Drammen Hospital, Vestre Viken HF, Drammen, Norway
9. Department of Rheumatology, Sørlandet Hospital HF, Kristiansand, Norway
10. Department of Rheumatology, Helgelandssykehuset Mo i Rana, Mo i Rana, Norway
11. Department of Rheumatology, Martina Hansens Hospital, Bærum, Norway
12. Faculty of Medicine, University of Oslo, Oslo, Norway
13. Division of Rheumatology, Brigham and Women’s Hospital, Boston, Massachusetts
14. Department of Rheumatology, Leiden University Medical Centre, Leiden, the Netherlands