1. Sorbonne Universités, UPMC University Paris 06, Institut Pierre Louis d'Epidémiologie et de Santé Publique, GRC-UPMC 08 (EEMOIS), AP-HP, Hôpital Pitié Salpêtrière; Paris France
2. University of Medicine and Pharmacy Carol Davila and St Maria Hospital; Bucharest Romania
3. National Institute of Rheumatology and Physiotherapy; Budapest Hungary
4. Ruhrgebiet, Herne and Ruhr-Universität Bochum; Herne Germany
5. Hospital Clínic and IDIBAPS; Barcelona Spain
6. Østfold University College, Halden, and Regional Research Support, Oslo University Hospital; Oslo Norway
7. University of Leeds; Leeds UK
8. Hacettepe University; Ankara Turkey
9. Diakonhjemmet Hospital; Oslo Norway
10. Tallinn Central Hospital; Tallinn Estonia
11. Sapienza Università di Roma; Rome Italy
12. III Medical University of Vienna; Vienna Austria
13. Dublin Academic Medical Centre and St Vincent's University Hospital; Dublin Ireland
14. University Hospitals Leuven; Leuven Belgium
15. Patient Research Partner, People with Arthritis/Rheumatism in Europe; Zurich Switzerland