1. Department of General Practice, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
2. Department of Paediatric Gastroenterology, Sydney Children’s Hospital, Randwick, Australia3University of Otago (Christchurch), Christchurch, New Zealand
3. Centre for Clinical Research, Department of Paediatrics, Västmanlands Hospital, Västerås, Sweden5Karolinska Institutet, Stockholm, Sweden
4. Department of Paediatric Gastroenterology and Nutrition, Royal Hospital for Sick Children, Edinburgh, Scotland7Child Life and Health, University of Edinburgh, Edinburgh, Scotland
5. School of Women’s and Children’s Health, Sydney Children’s Hospital, Randwick, Australia
6. Department of Paediatrics, Oslo University Hospital, Oslo, Norway
7. Deparment of Pediatrics, Children’s Hospital of Eastern Ontario, University of Ottawa, Ottawa, Canada
8. Department of Paediatric Gastroenterology, University Medical Centre Groningen, University of Groningen, Groningen, the Netherlands
9. Department of Paediatric Gastroenterology, Antwerp University Hospital, Edegem, Belgium
10. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands