1. 1Department of Periodontology and Oral Medicine, Medical Faculty, University of Nis, Dr Z. Djindjica 81 Blvd, 18000, Nis, Serbia
2. 2Institute of Pathology, Medical Faculty, University of Nis, Dr Z. Djindjica 81 Blvd, 18000, Nis, Serbia
3. 3Department of Oral Surgery, Dental Faculty, University of Podgorica, Krusevac bb Street, 81110, Podgorica, Monte Negro
4. 4Dental Clinic, Medical Faculty, University of Nis, Dr Z. Djindjica 81 Blvd, 18000, Nis, Serbia