1 Department of Surgical and Biomedical Sciences, School of Medicine, University of Perugia, Via G. Dottori, 06100, Perugia, Italy; General and Specialized Surgery Unit, "Santa Maria" Hospital, Via T. Di Joannuccio, 1, 05100, Terni, Italy.
2 Department of General Surgery, "Nuovo San Giovanni Battista" Hospital, Usl Umbria 2, Via M. Arcamone, 1, 06034, Foligno, PG, Italy.
3 General and Specialized Surgery Unit, "Santa Maria" Hospital, Via T. Di Joannuccio, 1, 05100, Terni, Italy.
4 Department of General Surgery, "Nuovo San Giovanni Battista" Hospital, Usl Umbria 2, Via M. Arcamone, 1, 06034, Foligno, PG, Italy. Electronic address: michele.derosa@nhs.net.