1. University of Belgrade, Faculty of Medicine, Institute of Rheumatology, Belgrade, Serbia + University of East Sarajevo, Faculty of Medicine, Sarajevo, Republic of Srpska, Bosnia and Herzegovina
2. Université de Brest, Rheumatology, Le centre hospitalier régional universitaire (CHU) Brest and UMR, Lymphocytes B et Autoimmunité, LabEx IGO, Brest, France
3. University of Akdeniz, Faculty of Medicine, Department of Physical Medicine, Rehabilitation, and Rheumatology, Antalya, Turkey
4. State Research Institute Centre for Innovative Medicine, Vilnius, Lithuania + University of Vilnius, Medical Faculty, Vilnius, Lithuania
5. University of Belgrade, Faculty of Medicine, Institute of Rheumatology, Belgrade, Serbia
6. Université de Lorraine, EA Apemac, Nancy, France + Inserm, CHRU Nancy, CIC- Epidémiologie Clinique, Nancy University hospital, Nancy, France