1. Department of Gastroenterology and Hepatopancreatology, Erasme University Hospital, Université Libre de Bruxelles, Brussels, Belgium
2. Department of Gastroenterology, Hôpital Nord, Aix Marseille Université, Marseille, France
3. Digestive Diseases Unit, Champalimaud Clinical Centre, Lisbon, Portugal
4. Digestive Endoscopy Unit, Fondazione Policlinico Universitario A. Gemelli, IRCCS, Rome, Italy