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aDepartment of Paediatrics, Division of Gastroenterology, Cantons Hospital of Fribourg,
Fribourg bInstitute of Social and Preventive Medicine, University of Lausanne cDepartment
of Pediatrics, Pediatric Gastroenterology Unit, Centre Hospitalier Universitaire Vaudois,
Lausanne dDivision of Pediatric Gastroenterology and Nutrition, University Children's
Hospital eChildren's Research Centre, University of Zurich, Zurich, Switzerland.