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1 Centre for Paediatric Gastronenterology, Royal Free and University College Medical School, RoyalFree Campus, London NW3 2PF, UK
2 Department of Histopathology, Royal Free and University College Medical School, Royal Free Campus, London NW3 2PF, UK
3 Institute of Child Health, Royal Liverpool Children's Hospital, Liverpool
4 Department of Paediatrics, Queen Elizabeth the Queen Mother Hospital, Margate, Kent
5 Department of Child Psychiatry, Royal Free and University College Medical School, RoyalFree Campus, London NW3 2PF, UK
6 Department of Radiology, Royal Free and University College Medical School, RoyalFree Campus, London NW3 2PF, UK
7 Department of Histopathology and Cytology, Addenbrooke's Hospital, Cambridge, UK





