1. Department of Paediatric Gastroenterology, University of Groningen, University Medical Centre Groningen,Groningen, The Netherlands
2. Paediatric Gastroenterology and Liver Unit, Sapienza University of Rome, University Hospital Umberto I, Rome, Italy
3. Department of Gastroenterology, Rabin Medical Center – Beilinson Hospital, Petah Tikva, Israel
4. Department of Paediatrics, Hvidovre University Hospital, Hvidovre, Denmark
5. Department of Gastroenterology, Queen Elizabeth Hospital, Birmingham, UK
6. Department of Gastroenterology, Centre for Colorectal Disease, St Vincent’s University Hospital, Dublin, Ireland
7. Department of Paediatric Gastroenterology, Erasmus University Medical Centre, Sophia Children’s Hospital, Rotterdam, The Netherlands
8. Department of Gastroenterology, Hepatology, Feeding Disorders and Paediatrics, Children’s Memorial Health Institute, Warsaw, Poland
9. Department of Gastroenterology, Barts Health NHS Trust, The Royal London Hospital, London, UK
10. First Department of Paediatrics, Gastroenterology Unit, University of Athens, Athens, Greece
11. Department of Paediatric Gastroenterology, The Royal Hospital for Children, Glasgow, UK
12. Imperial College, London; and Chelsea and Westminster Hospital, London, UK