1 Department of General and Emergency Surgery, Santa Maria della Misericordia Hospital, University of Perugia, Via Dottori, 06134 Perugia, Italy. Electronic address: luiginagraziosi@yahoo.it.
2 Department of General and Emergency Surgery, Santa Maria della Misericordia Hospital, University of Perugia, Via Dottori, 06134 Perugia, Italy. Electronic address: elisabetta.marino1986@gmail.com.
3 Department of General and Emergency Surgery, Santa Maria della Misericordia Hospital, University of Perugia, Via Dottori, 06134 Perugia, Italy. Electronic address: emanuelcavazzoni@hotmail.com.
4 Department of General and Emergency Surgery, Santa Maria della Misericordia Hospital, University of Perugia, Via Dottori, 06134 Perugia, Italy. Electronic address: dna@unipg.it.