G Troiano1, S Staibano2, M E Licata3, N Termine3, L Lo Muzio4. 1. Department of Sperimental and Clinical Medicine, University of Foggia, Italy. 2. Department of Advanced Biomedical Sciences, University of Naples, Italy. 3. Department of Surgical, Oncologic and Stomatologic Sciences, University of Palermo, Italy. 4. Department of Surgical Sciences, University of Foggia, Italy.