1. Center for Rheumatology and Spine Diseases, Copenhagen Center for Arthritis Research (COPECARE) , Denmark
2. DANBIO Registry, Rigshospitalet , Glostrup, Denmark
3. Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg , Gothenburg, Sweden
4. Department of Medicine Solna, Karolinska Institutet , Stockholm, Sweden
5. Center for Treatment of Rheumatic and Musculoskeletal Diseases (REMEDY), Diakonhjemmet Hospital , Oslo, Norway
6. Research Unit, Sørlandet Hospital , Kristiansand, Norway
7. Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet , Stockholm, Sweden
8. Department of Clinical Sciences Lund, Rheumatology, Skåne University Hospital, Lund University , Lund, Sweden
9. Centre for Rheumatology Research, Landspitali, University Hospital , Reykjavik, Iceland
10. Faculty of Medicine, University of Iceland , Reykjavik, Iceland
11. Department for Science and Research, Landspitali University Hospital , Reykjavik, Iceland
12. Departments of Medicine and Rheumatology, Helsinki University Hospital , Helsinki, Finland
13. Department of Rheumatology, Satakunta Central Hospital , Rauma, Finland
14. Institute of Rheumatology , Prague, Czech Republic
15. Department of Rheumatology, First Faculty of Medicine, Charles University , Prague, Czech Republic
16. Rheumatology Unit, DETO, University of Bari , Bari, Italy
17. Rheumatology Unit, Department of Medical Sciences and Public Health, AOU and University of Cagliari , Monserrato, Italy
18. Department of Rheumatology, Aarhus University Hospital , Aarhus, Denmark
19. Department of Clinical Medicine, Aarhus University , Aarhus, Denmark
20. Department of Clinical Medicine, University of Copenhagen , Copenhagen, Denmark
21. Department of Rheumatology, East-Tallinn Central Hospital , Tallinn, Estonia
22. Department of Rheumatology, University Medical Centre Ljubljana , Ljubljana, Slovenia
23. Faculty of Medicine, University of Ljubljana , Ljubljana, Slovenia
24. Aberdeen Centre for Arthritis and Musculoskeletal Health (Epidemiology Group), University of Aberdeen , Aberdeen, UK
25. Department for Rheumatology and Immunology, Inselspital, University Hospital Bern , on behalf of the Swiss Clinical Quality Management for Rheumatic Diseases, SCQM, Zürich, Switzerland
26. Amsterdam UMC, University of Amsterdam, Department of Rheumatology & Clinical Immunology and Department of Experimental Immunology, Amsterdam Institute for Infection & Immunity , Amsterdam, The Netherlands
27. Amsterdam Rheumatology and Immunology Center (ARC) , Amsterdam, The Netherlands
28. Center for Rheumatic Diseases, University of Medicine and Pharmacy, Romanian Registry of Rheumatic Diseases , Bucharest, Romania
29. Department of Rheumatology, Geneva University Hospital , Geneva, Switzerland
30. Division of Rheumatology, Department of Internal Medicine, Dokuz Eylul University School of Medicine , Izmir, Turkey
31. Department of Rheumatology, Ankara Yıldırım Beyazıt University Ankara City Hospital , Ankara, Turkey
32. Serviço de Reumatologia, Hospital Garcia de Orta , Almada, Portugal
33. Reuma.pt, Sociedade Portuguesa de Reumatologia , Lisbon, Portugal
34. Department of Rheumatology, Hospital de Santa Maria, CHULN, Instituto Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, Centro Académico de Medicina de Lisboa , Lisbon, Portugal