1. Department of Pediatric Gastroenterology, Hopital Universitaire des Enfants Reine Fabiola, Université Libre de Bruxelles, 1000 Brussels, Belgium
2. Belgian Helicobacter and Microbiota Study Group (BHMSG), 1000 Brussels, Belgium
3. Department of Microbiology, Laboratoire Hospitalier Universitaire de Bruxelles-Brussel Universitair Laboratorium (LHUB-ULB), Université Libre de Bruxelles, 1000 Brussels, Belgium