1. Gastroenterology and Gastrointestinal Endoscopy Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy
2. Vita-Salute San Raffaele University, Milan, Italy
3. Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milan, Italy
4. Department of Gastroenterology, University of Lorraine, CHRU-Nancy, F-54000, Nancy, France
5. Department of Gastroenterology, University of Lorraine, Inserm, NGERE, F-54000, Nancy, France