1. University of Kragujevac, Faculty of Medical Sciences, Department of Dentistry, Kragujevac, Serbia
2. Military Medical Academy, Dental Clinic, Belgrade, Serbia + University of Defence, Faculty of Medicine of the Medical Military Academy, Belgrade, Serbia
3. University of Kragujevac, Faculty of Medical Sciences, Department of Surgery, Kragujevac, Serbia
4. University of Niš, Faculty of Medicine, Preventive and Pediatric Dentistry, Niš, Serbia
5. Institute of Dentistry, Kragujevac, Serbia