1. Medical SchoolSt George's Hospital London UK
2. Department of GastroenterologySt George's University Hospitals NHS Foundation Trust London UK
3. Department of RadiologySt George's University Hospitals NHS Foundation Trust London UK
4. Department of Paediatric GastroenterologySt George's University Hospitals NHS Foundation Trust London UK
5. Child Health Unit, School of Public HealthImperial College London London UK
6. Centre for Medical ImagingUniversity College London London UK