1. Division of Rheumatology, Jewish General Hospital, Montreal, QC, Canada
2. Division of Rheumatology, University of Toledo Medical Center, Toledo, OH, USA
3. College of Physicians and Surgeons, Columbia University, New York, NY, USA
4. Division of Immunology & Rheumatology, School of Medicine, Stanford University, Palo Alto, CA, USA
5. Ronald Reagan UCLA Medical Center, University of California, Los Angeles, Los Angeles, CA, USA
6. University College London, London, UK
7. Institute of Immunity and Transplantation, University College London, London, UK
8. Arthritis and Autoimmunity Center, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
9. Department of Rheumatology, St Vincent’s Hospital, Melbourne, VIC, Australia
10. Hamburg Centre for Pediatric Rheumatology, Hamburg, Germany
11. Division of Rheumatology, School of Medicine, University of Utah, Salt Lake City, UT, USA
12. Division of Rheumatology, Hospital for Special Surgery, New York, NY, USA
13. Division of Rheumatology, Toronto Western Hospital, Toronto, ON, Canada
14. Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
15. Division of Rheumatology, Johns Hopkins Hospital, Baltimore, MD, USA
16. Department of Medicine, University of Pennsylvania, Philadelphia, PA, USA
17. Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Philadelphia, PA, USA
18. Division of Rheumatology, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA
19. Department of Rheumatology, Royal National Hospital for Rheumatic Diseases, University of Bath, Bath, UK
20. Rheumatology Unit, University Hospital of Cagliari