- Correspondence to Professor Julian RF Walters, Division of Digestive Diseases, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0HS, UK;
- Received 9 February 2017
- Revised 15 May 2017
- Accepted 17 May 2017
- Published in print 28 June 2017.
- Published online 29 June 2017.
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