Department of Gastroenterology, University Hospitals Leuven, Leuven, Belgium. Electronic address: Severine.Vermeire@uzleuven.be. Department of Gastroenterology and Clinical Nutrition, CHU of Nice, University Côte d'Azur, Nice, France. Department of Gastroenterology, Hepatology, Endocrinology & Metabolism, Medical University Innsbruck, Innsbruck, Austria. Department of Pathology, University Hospitals Leuven, Leuven, Belgium; Abivax, Paris, France.