- Correspondence to Dr Alex Ford, Leeds Gastroenterology Institute, St. James's University Hospital, Room 125, 4th Floor, Bexley Wing, Beckett Street, Leeds LS9 7TF, UK;
- Received 13 September 2015
- Revised 13 October 2015
- Accepted 24 October 2015
- Published in print 1 March 2017.
- Published online 15 February 2017.
- Published first 13 November 2015.
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