- Correspondence to Dr H J N Andreyev, The GI Unit, The Royal Marsden NHS Foundation Trust, Fulham Rd, London SW3 6JJ, UK;
- Received 20 April 2016
- Revised 30 June 2016
- Accepted 18 July 2016
- Published in print 1 October 2017.
- Published online 11 September 2017.
- Published first 14 October 2016.
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