1. Department of Paediatric Gastroenterology, Erasmus MC–Sophia Children's Hospital, Rotterdam, the Netherlands
2. Department of Paediatrics, Erasmus MC–Sophia Children's Hospital, Rotterdam, the Netherlands
3. Department of Dietetics, Erasmus MC–Sophia Children's Hospital, Rotterdam, the Netherlands
4. Department of Paediatrics, HAGA Hospital–Juliana Children's Hospital, The Hague, the Netherlands
5. Department of Paediatrics, Gelre Hospital, Apeldoorn, the Netherlands
6. Department of Paediatrics, Tergooi Hospital, Blaricum, the Netherlands
7. Department of Paediatrics, Sint Lucas Andreas Hospital, Amsterdam, the Netherlands
8. Department of Paediatrics, Groene Hart Hospital, Gouda, the Netherlands
9. Department of Paediatrics, Sint Francisus Hospital, Rotterdam, the Netherlands
10. Department of Paediatrics, Maasstad Hospital, Rotterdam, the Netherlands
11. Department of Paediatrics, Amphia Hospital, Breda, the Netherlands
12. Department of Dietetics, MC Alkmaar, Alkmaar, the Netherlands