1. Coloproctology Unit, Casa di Cura San Camillo-Forte dei Marmi, Lucca, Italy
2. General Surgery and Breast Unit, IRCCS “San Martino-IST”, Genoa, Italy
3. Medical Oncology, IRCCS “San Martino-IST”, Genoa, Italy
4. General Surgery, Casa di Cura Triolo-Zancla e Villa Serena, Palermo, Italy
5. Coloproctology Unit, San Camillo Hospital, Rome, Italy
6. General Surgery, Villa Paideia Hospital, Rome, Italy
7. General Surgery, Celio Military Hospital, Rome, Italy
8. General Surgery, Policlinico Umberto I, Rome, Italy
9. General Surgery, San Carlo IDI Hospital, Rome, Italy
10. General Surgery, Fatebenefratelli Hospital, Rome, Italy