1. Department of Medical and Surgical Sciences (DIMEC) University of Bologna Bologna Italy
2. General and Oncologic Surgery Morgagni Pierantoni Hospital Ausl Romagna Forlì Italy
3. General Surgery Unit Department of Surgery “A. Gemelli” University Hospital Catholic University of Rome Rome Italy
4. Department of Clinical Medicine and Surgery University of Naples Federico II Naples Italy
5. Digestive Surgery European Institute of Oncology IRCCS Milan Italy
6. Department of Digestive Surgery and Liver Unit Santa Maria Hospital Terni Italy