Affiliation: | (1) Wolfson Unit for Endoscopy, St. Mark’s Hospital, Watford Road, Harrow, Imperial College London, London, UK;(2) Department of Intestinal Imaging, St. Mark’s Hospital, Watford Road, Harrow, Imperial College London, London, UK;(3) Department of Specialist Radiology, 2F Podium, University College Hospital, 235 Euston Road, London, NW1 2BU, UK |