1. Faculty of Medicine, Institute of Rheumatology, Belgrade + University of East Sarajevo, Faculty of Medicine, East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
2. Faculty of Medicine, Institute of Rheumatology, Belgrade
3. Faculty of Medicine, Institute of Epidemiology, Belgrade
4. INSERM-CIC-EC, University Hospital and University of Lorraine, EA APEMAC, Nancy, France