1. Division of Oral Medicine Department of Medical, Surgical and Health Sciences University of Trieste Trieste Italy
2. Unit of Oral and Maxillofacial Surgery Ca Foncello Hospital Treviso Italy
3. Institute of Pathological Anatomy and Histology Ospedali Riuniti and University of Trieste Trieste Italy
4. Department of Mathematics and Geoscience University of Trieste Trieste Italy