1. Faculty of Medicine; University of Belgrade; Belgrade Serbia
2. Clinic for Physical Medicine and Rehabilitation; Clinical Center Serbia; Belgrade Serbia
3. Institute of Epidemiology; Faculty of Medicine; University of Belgrade; Belgrade Serbia
4. Institute of Medical Statistics and Medical Informatics; Faculty of Medicine; University of Belgrade; Belgrade Serbia
5. Institute of Anesthesia and Reanimation; Clinical Center Serbia; Belgrade Serbia
6. Clinic for Orthopaedic Surgery and Traumatology; Clinical Center Serbia; Belgrade Serbia