1. ROB-FIN Register, Division of Rheumatology, Helsinki University Hospital , Helsinki, Finland
2. Division of Rheumatology, Päijät-Häme Central Hospital , Lahti, Finland
3. Pharmaceuticals Pricing Board, Ministry of Social Affairs and Health , Helsinki, Finland
4. Division of Rheumatology, Helsinki University Hospital, Helsinki University , Helsinki, Finland
5. Unit of Health Sciences, Faculty of Social Sciences, Tampere University , Tampere, Finland
6. Centre for Rheumatic Diseases, Tampere University Hospital , Tampere, Finland
7. Division of Medicine, University Hospital , Kuopio, Finland
8. Division of Medicine, Turku University Hospital , Turku, Finland
9. Division of Rheumatology, Helsinki University , Helsinki, Finland
10. Helsinki Rheumatic Diseases and Inflammation Research Group, University of Helsinki , Helsinki, Finland