1. Department of Pediatric Gastroenterology Erasmus Medical Center – Sophia Children's Hospital Rotterdam the Netherlands
2. Department of Pediatrics, Amsterdam UMC Vrije Universiteit Amsterdam, Emma Children's Hospital Amsterdam the Netherlands
3. Department of Pediatric Surgery Erasmus Medical Center – Sophia Children's Hospital Rotterdam the Netherlands
4. Department of Dietetics Erasmus Medical Center – Sophia Children's Hospital Rotterdam the Netherlands
5. Department of Pediatric Gastroenterology, Amsterdam UMC University of Amsterdam, Emma Children's Hospital Amsterdam the Netherlands
6. Department of Dietetics, Amsterdam UMC University of Amsterdam Amsterdam the Netherlands
7. UCL Great Ormond Street Institute of Child Health London United Kingdom
8. Department of Pediatric Gastroenterology Leiden University Medical Center – Willem Alexander Children's Hospital Leiden the Netherlands