Peter Bossuyt1, Séverine Vermeire2, Raf Bisschops2. 1. Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium; Imelda GI Clinical Research Centre, Imelda General Hospital, Bonheiden, Belgium. 2. Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium.