1. UZ Brussel; Free University of Brussels; Brussels Belgium
2. Pediatric Gastroenterology; Hepatology and Nutrition Department; Necker Children's Hospital; Paris France
3. Pediatric Allergy Unit; University Hospitals of Geneva; Geneva Switzerland
4. Department of Paediatrics; Hans Christian Andersen Children's Hospital; Odense University Hospital; Odense Denmark
5. Children's Hospital; University of Helsinki and Helsinki University Central Hospital; Helsinki Finland
6. Paediatric Gastroenterology and Hepatology Unit. La Fe University Hospital.; Valencia Spain
7. Great Ormond Street Hospital for Children London (UK) and KU Leuven; Belgium UK
8. TARGID; Leuven Belgium
9. Institute of Gastroenterology Nutrition and Liver Diseases; Schneider Children's Medical Center of Israel; Sackler Faculty of Medicine Tel-Aviv University; Tel-Aviv Israel
10. Department of Translational Medical Science; Section of Pediatrics; University of Naples Federico II; Naples Italy
11. Department of Paediatric; The Medical University of Warsaw; Warsaw Poland
12. Research Institute; Department of Pediatrics; Marien-Hospital; Wesel Germany