1. Institute of Occupational Health and Sports Medicine Republic of Srpska, Center Bijeljina, 76 300 Bijeljina, Bosnia and Herzegovina
2. Faculty of Medicine, University of Banja Luka, 78 000 Banja Luka, Bosnia and Herzegovina
3. Clinical Center of Montenegro, Clinic for Psychiatry, 81 000 Podgorica, Montenegro
4. Department of Occupational Medicine, Institute of Occupational Health of Novi Sad, 21 000 Novi Sad, Serbia
5. Faculty of Medicine, University of Novi Sad, 21 000 Novi Sad, Serbia
6. Institute of Epidemiology, Faculty of Medicine, University of Belgrade, 11 000 Belgrade, Serbia