1. Consultant Gastroenterologist, Department of Gastroenterology, Hope Hospital, Stott Lane, Salford, Manchester, M6 8HD, UK
2. University of Manchester, Division of Medicine and Neurosciences, Gastointestinal Sciences, Oxford Road, Manchester, M13 9PL, UK
3. Senior Lecturer in Medicine and Physiological Sciences, Neurogastroenterology Unit, Academic Division of Medicine and Surgery, Wythenshawe Hospital, Southmoor Road, Wythenshawe, Manchester, M23 9LT, UK.