Antonio Pesce1, Carlo Vittorio Feo2,3. 1. Unit of General Surgery, Ospedale del Delta, Azienda USL Di Ferrara, Ferrara, Italy. nino.fish@hotmail.it. 2. Unit of General Surgery, Ospedale del Delta, Azienda USL di Ferrara, Ferrara, Italy. 3. Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, Ferrara, Italy.