1 General Surgery Unit, Department of Surgery, "A. Gemelli" University Hospital, Catholic University of Rome, 00168 Rome, Italy. Electronic address: domenico.dugo@policlinicogemelli.it.
2 Surgical Oncology Unit, Humanitas Clinical and Research Center, 20089 Rozzano, Italy.
3 General Surgery Unit, Department of Surgery, "A. Gemelli" University Hospital, Catholic University of Rome, 00168 Rome, Italy.