1. Department of Pediatric Gastroenterology, Emma Children’s Hospital and Academic Medical Center, Amsterdam, the Netherlands
2. Department of Pediatrics, St. Antonius Hospital, Nieuwegein, the Netherlands
3. Department of Pediatrics, Medical Center Alkmaar, Alkmaar, the Netherlands
4. Department of Pediatrics, Maasstad Hospital, Rotterdam, the Netherlands
5. Department of Pediatrics, Isala Clinics, Zwolle, the Netherlands
6. Department of Pediatrics, Maxima Medical Center, Veldhoven, the Netherlands
7. Department of Pediatrics, Amphia Hospital, Breda, the Netherlands
8. Clinical Research Unit, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands