1. Paediatric Gastroenterology-Hepatology; Queen Fabiola Children's University Hospital; Université Libre de Bruxelles; Av JJ Crocq 15 1020 Brussels Belgium
2. Laboratory of Vaccinology and Mucosal Immunity; Université Libre de Bruxelles; Route de Lennik 808 1070 Brussels Belgium
3. Centre for Cell Signalling; Barts Cancer Institute; Queen Mary University of London; Charterhouse Square London EC1M 6BQ UK
4. Department of Gastroenterology; Nouvelle Clinique de la Basilique; Rue Pangaert 37 1083 Brussels Belgium
5. Department of Pathology; University Hospital Brugmann; Université Libre de Bruxelles; Place Van Gehuchten 4 1020 Brussels Belgium
6. Immunobiology Clinic; Academic Hospital Erasme; Université Libre de Bruxelles; Route de Lennik 808 Brussels Belgium