1. Department of Pediatrics, Division of Gastroenterology, Erasmus MC Sophia Children’s Hospital, University Medical Center Rotterdam, Rotterdam, The Netherlands
2. Department of Child and Adolescent Psychiatry/Psychology, Erasmus MC Sophia Children’s Hospital, University Medical Center Rotterdam, Rotterdam, The Netherlands
3. Department of Pediatrics, Division of Gastroenterology, AMC Emma Children’s Hospital, Amsterdam University Medical Center, Amsterdam, The Netherlands
4. Department of Pediatrics, Division of Gastroenterology, Willem Alexander Children’s Hospital, Leiden University Medical Center, Leiden, The Netherlands
5. Department of Pediatric Surgery, Erasmus MC Sophia Children’s Hospital, University Medical Center Rotterdam, Rotterdam, The Netherlands