1 General and Emergency Surgical Department, University of Perugia, Santa Maria della Misericordia Hospital, Via Dottori, 06132, Perugia, Italy. Electronic address: luiginagraziosi@yahoo.it.
2 General and Emergency Surgical Department, University of Perugia, Santa Maria della Misericordia Hospital, Via Dottori, 06132, Perugia, Italy.