1. Department of HBP & Digestive Surgery, University of Milan, San Paolo Hospital, Via A. Di Rudinì 8, 20142 Milan, Italy
2. Department of Digestive Endoscopy, San Paolo Hospital, Via A. Di Rudinì 8, 20142 Milan, Italy
3. Department of Diagnostic & Interventional Radiology, University of Milan, San Paolo Hospital, Via A. Di Rudinì 8, 20142 Milan, Italy