1. Division of Gastroenterology and Department of Pediatrics, Centre Hospitalier Universitaire Laval, Laval, Canada
2. Centre Hospitalier Universitaire Laval, Laval, Canada
3. Department of Pathology, Centre Hospitalier Universitaire Laval, Laval, Canada
4. Centre Hospitalier Universitaire Sainte-Justine, Montréal, Québec, Canada