1. Hepato-Gastroenterology and Digestive Oncology, University Hospital CHU of Liège, Liège, Belgium
2. Department of Gastroenterology and Endoscopy, IRCCS San Raffaele Hospital and Vita-Salute San Raffaele University, Milan, Italy
3. CHRU-Nancy, Department of Gastroenterology, University of Lorraine, Nancy, France
4. Inserm, NGERE, University of Lorraine, Nancy, France