1. Proctology and Pelvic Floor Clinical Centre, Cisanello University Hospital, Pisa, Italy
2. Department of Medical and Surgical Sciences, University of Catanzaro, Catanzaro, Italy
3. Department of Medical, Surgical, Neurologic, Metabolic and Aging Sciences, General, Mininvasive and Obesity Surgery Unit, University of Campania "Luigi Vanvitelli" Naples, Italy
4. Proctology and Pelvic Floor Clinical Centre, General Surgery, Pisa, Italy