Calogero Cipolla1, Eugenio Fiorentino2. 1. Department of Surgical Oncological and Oral Sciences, University of Palermo, Via del Vespro 129, 90127, Palermo, Italy. calogero.cipolla@unipa.it. 2. Department of Surgical Oncological and Oral Sciences, University of Palermo, Via del Vespro 129, 90127, Palermo, Italy.