1. Great Ormond Street Institute of Child Health, University College London, London, UK;
2. Hospital of St. John and St Elizabeth, London, UK;
3. School of Health and Social Work, University of Hertfordshire, Hatfield, UK;
4. Imperial College Healthcare NHS Trust, Paediatrics, St. Mary’s Hospital, London, UK;
5. Department of Pathology, Cambridge University, Cambridge, UK;
6. Neurogastroenterology, Queen Mary University of London, London, UK;
7. Physiocare, Twyford, UK