1. Center for Rheumatology and Spine Diseases, Center for Head and Orthopaedics, Copenhagen Center for Arthritis Research (COPECARE), Rigshospitalet , Glostrup, Denmark
2. DANBIO Registry, Center for Rheumatology and Spine Diseases, Center for Head and Orthopaedics, Rigshospitalet , Glostrup, Denmark
3. Department of Clinical Sciences Lund, Rheumatology, Skåne University Hospital, Lund University , Lund, Sweden
4. Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet , Stockholm, Sweden
5. Institute of Rheumatology and Department of Rheumatology, 1st Faculty of Medicine, Charles University , Prague, Czech Republic
6. Department of Rheumatology, Hospital General Universitario Gregorio Marañón and Faculty of Medicine, Complutense University of Madrid , Madrid, Spain
7. Department of Internal Medicine, Dermatology and Psychiatry, Universidad de La Laguna and Rheumatology Service, Hospital Universitario de Canarias , La Laguna, Spain
8. Department of Rheumatology, University Medical Centre Ljubljana and Faculty of Medicine, University of Ljubljana , Ljubljana, Slovenia
9. Department of Clinical Medicine, University of Copenhagen , Copenhagen, Denmark
10. Centre for Rheumatology Research (ICEBIO), Landspitali University Hospital, Reykjavik, Iceland and Faculty of Medicine, University of Iceland , Reykjavik, Iceland
11. Department of Rheumatology, University Hospital , Reykjavik, Iceland
12. Center for treatment of Rheumatic and Musculoskeletal Diseases (REMEDY), Diakonhjemmet Hospital , Oslo, Norway
13. Research Unit, Sørlandet Hospital , Kristiansand, Norway
14. Department of Rheumatology, Hospital Garcia de Orta, Almada and Instituto Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa , Lisbon, Portugal
15. Department of Rheumatology, Centro Hospitalar do Baixo Vouga, Aveiro and Comprehensive Health Research Centre, NOVA Medical School, Universidade Nova de Lisboa , Lisbon, Portugal
16. Departments of Medicine and Rheumatology, Helsinki University Hospital , Helsinki, Finland
17. Inflammation Center, Department of Rheumatology, Helsinki University Hospital , Helsinki, Finland
18. Department of Rheumatology, University Hospital Zurich, University of Zurich , Zurich, Switzerland
19. Department of Rheumatology, Geneva University Hospital , Geneva, Switzerland
20. School of Medicine, Department of Internal Medicine, Division of Rheumatology, Izmir Katip Celebi University , Izmir, Turkey
21. Zitelab ApS , Copenhagen, Denmark