1. Research Centre for Biomedicine, Faculty of Medicine University of Nis Nis Serbia
2. Department of Restorative Dentistry and Endodontics, Dental Clinic, Faculty of Medicine University of Nis Nis Serbia
3. Department of Orthopedics of Jaws and Teeth, Faculty of Medicine University of Nis Nis Serbia
4. Department of Dentistry, Faculty of Medicine University of Kragujevac Kragujevac Serbia
5. Department of Medical Statistics and Informatics, Faculty of Medicine University of Nis Nis Serbia