1. Department of Social Medicine, Faculty of Medical Sciences, University of Kragujevac and Institute of Public Health, Kragujevac, Serbia
2. Department of Hygiene, Faculty of Medical Sciences, University of Kragujevac, Serbia and Institute of Public Health, Kragujevac, Serbia
3. Department of Social Medicine, Faculty of Medical Sciences, University of Kragujevac, Serbia
4. Institute of Public Health, Kragujevac, Serbia