Nadia Peparini1, Fabio Benedetti2. 1. Azienda Sanitaria Locale Roma H, Distretto 3, Via Mario Calò, 5, 00043, Ciampino, Rome, Italy. nadiapeparini@yahoo.it. 2. Department of Surgical Sciences, Sapienza University of Rome, viale Regina Elena 324, 00161, Rome, Italy.