1 General Surgery Unit, Department of Surgical, Oncological and Stomatological Sciences, University of Palermo, Via Liborio Giuffrè, 5, 90127, Palermo, Italy.
2 General Surgery Unit, Department of Surgical, Oncological and Stomatological Sciences, University of Palermo, Via Liborio Giuffrè, 5, 90127, Palermo, Italy. divitagaetano@libero.it.