- Correspondence to Dr Victoria Gibson, Department of Gastroenterology, Newcastle upon Tyne Hospitals NHS foundation trust, Freeman Hospital, Freeman Road, Newcastle upon Tyne, UK;
- Received 17 January 2017
- Revised 1 June 2017
- Accepted 3 July 2017
- Published in print 1 January 2018.
- Published online 8 December 2017.
- Published first 10 August 2017.
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