1. Diagnostic and Therapeutic Endoscopy Unit, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy
2. Department of Gastroenterology and Hepatology, University Medical Center Utrecht, Utrecht, The Netherlands
3. Department of Radiology, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy
4. Department of Surgery, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy