1. Department of Gastroenterology, Royal Bournemouth Hospital, Bournemouth, UK
2. Dorset Research and Development Support Unit, School of Health and Social Care, Bournemouth University, Bournemouth, UK
3. Division of Public Health and Epidemiology, Queens Medical Centre, Nottingham, UK
4. Department of Radiology, Wythenshawe Hospital, Wythenshawe, Manchester, UK
5. Department of Gastroenterology, Guy's and St Thomas' NHS Foundation Trust, London, UK
6. Department of Gastroenterology, Royal Liverpool University Hospital, Liverpool, UK