General, Emergency and Mini-invasive Surgery, Careggi University Hospital, Largo Brambilla 3, 50134, Florence, Italy. jamjac64@hotmail.com. General Surgery Unit, Prato Hospital, Prato, Italy. General Surgery Unit, Pescia Hospital, Pescia, Italy. General Surgery Unit, Borgo San Lorenzo Hospital, Borgo San Lorenzo, Italy. General Surgery Unit, Massa Hospital, Massa, Italy. Proctological and Perineal Surgical Unit, Cisanello University Hospital, Pisa, Italy.