1. University of Pristina – Kosovska Mitrovica, Faculty of Medicine, Serbia
2. Clinical-Hospital Center Pristina-Gracanica, Kosovska Mitrovica, Serbia
3. Neurology Clinic, Clinical Center of Serbia, Belgrade, Serbia
4. University of Belgrade, Faculty of Medicine, Belgrade, Serbia
5. Institute of Mental Health, Belgrade, Serbia
6. University of Belgrade, Faculty of Medicine, Institute of Epidemiology, Belgrade, Serbia