1. Department of Oral Medicine and Periodontology, Dental Clinic Medical Faculty, University of Niš, Niš, Serbia
2. Department of Restorative Dentistry and Endodontics, Dental Clinic Medical Faculty, University of Niš, Niš, Serbia
3. Department of Epidemiology, Institute of Public Health, Medical Faculty, University of Niš, Niš, Serbia
4. Department of Medical Statistics and Informatics, Medical Faculty, University of Niš, Niš, Serbia
5. Inter Dental Clinic, Medical Faculty, University of Niš, Niš, Serbia
6. Department of Prosthetics, Dental Clinic, Medical Faculty, University of Niš, Niš, Serbia