- Correspondence to Dr Anthony O'Connor, Leeds Gastroenterology Institute, Bexley Wing, St James's University Hospital, Leeds LS97TF, UK;
- Received 31 August 2016
- Revised 24 October 2016
- Accepted 26 October 2016
- Published in print 1 July 2017.
- Published online 5 June 2017.
- Published first 1 December 2016.
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