1. Department of Periodontology and Oral Medicine, Clinic of Dental Medicine, Medical Faculty University of Nis Nis Serbia
2. Department of Prosthodontics, Clinic of Dental Medicine, Medical Faculty University of Nis Nis Serbia
3. Postdoctoral Study, Department of Periodontology and Oral Medicine, Medical Faculty University of Nis Nis Serbia
4. Postdoctoral Study, Department of Prosthodontics, Medical Faculty University of Nis Nis Serbia