1. Gastroenterology and Endoscopy, IRCCS Ospedale San Raffaele and Vita-Salute San Raffaele University , Milan , Italy
2. Department of Biomedical Sciences, Humanitas University , Pieve Emanuele, Milan , Italy
3. Gastrointestinal Surgery Unit, IRCCS Ospedale San Raffaele , Milan Italy
4. Division of Colon and Rectal Surgery, IRCCS Humanitas Research Hospital , Rozzano, Milan , Italy
5. University of Lorraine, CHRU-Nancy, Department of Gastroenterology , F-54000 Nancy , France
6. University of Lorraine, Inserm, NGERE , F-54000 Nancy , France