1. Department of Surgery Galliera Hospital Genoa Italy
2. Unit of Coloproctology Hospital of Sanremo Sanremo Italy
3. Clinical Epidemiology Unit Ospedale Policlinico San Martino Genoa Italy
4. Department of General and Digestive Surgery Colorectal Unit Bellvitge University Hospital Barcelona Spain
5. IDIBELL University of Barcelona Barcelona Spain
6. Department of Medical Surgical Critical Care Careggi Hospital Florence Italy
7. Abdominal Oncology Department Istituto Nazionale Tumori IRCCS, G. Pascale Naples Italy