1. Centre for Neuroscience and TraumaBlizard Institute, Wingate Institute of NeurogastroenterologyBarts and the London School of Medicine & DentistryQueen Mary University of London 26 Ashfield Street London E1 2AJ UK
2. Department of NeuroimagingKing's College LondonInstitute of Psychiatry Psychology & Neuroscience London SE5 8AF UK
3. Division of Biomedical SciencesSt George's University of London London SW17 0RE UK
4. Institute of Applied Clinical SciencesUniversity of Keele Keele ST5 5BG UK
5. Department of GastroenterologyUniversity Hospitals of North Midlands NHS Trust Stoke on Trent ST6 8QG UK