1. Paediatric Gastroenterology, Hepatology and Nutrition, Department of Paediatrics, University of Groningen, University Medical Center Groningen, Hanzeplein, Groningen, The Netherlands
2. Department of Laboratory Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein, Groningen, The Netherlands
3. Department of Microbiology, University of Groningen, University Medical Center Groningen, Hanzeplein, Groningen, The Netherlands
4. Department of Paediatric Gastroenterology, Hepatology and Nutrition, Emma Children’s Hospital Academic Medical Centre, Meibergdreef, Amsterdam, The Netherlands
5. Department of Paediatric Gastroenterology, Hepatology and Nutrition, Wilhelmina Children’s Hospital, Lundlaan, Utrecht, The Netherlands
6. Department of Paediatric Gastroenterology, Hepatology and Nutrition, VU Medical Centre, De Boelelaan, Amsterdam, The Netherlands
7. Department of Paediatrics, Isala Clinic, Dokter van Heesweg, Zwolle, The Netherlands
8. Department of Gastroenterology and Hepatology, University of Groningen, University Medical Center Groningen, Hanzeplein, Groningen, The Netherlands
9. Department of Paediatrics, Rijnstate Hospital, Wagnerlaan, Arnhem, The Netherlands
10. Department of Paediatrics, Medisch Spectrum Twente, Koningsplein, Enschede, The Netherlands
11. Department of Paediatric Gastroenterology, Hepatology and Nutrition, Erasmus Medical Center-Sophia Children’s Hospital, Wytemaweg, Rotterdam, The Netherlands
12. Department of Paediatric Gastroenterology, Hepatology and Nutrition, Amphia Hospital, Langendijk, Breda, The Netherlands
13. Department of Paediatric Gastroenterology, Hepatology and Nutrition, Juliana Children’s Hospital/Haga, Els Borst-Eilersplein, The Hague, The Netherlands
14. Department of Paediatric Gastroenterology, Hepatology and Nutrition, Leiden University Medical Centre, Albinusdreef, Leiden, The Netherlands
15. Department of Epidemiology, University of Groningen, University Medical Center Groningen, Hanzeplein, The Netherlands