Affiliation: | 1. Department of Paediatric Gastroenterology, The Children''s Centre, The General Infirmary at Leeds, Leeds LS2 9NS, UK;2. Department of Radiology, The Children''s Centre, The General Infirmary at Leeds, Leeds LS2 9NS, UK;3. Department of Radiology, Bradford Royal Infirmary, Bradford BD9 6RJ, UK |