- Correspondence to Professor Owen Epstein, Royal Free London NHS Foundation Trust, Pond Street, London NW2 2QG, UK;
- Received 16 January 2017
- Revised 17 March 2017
- Accepted 2 April 2017
- Published in print 1 October 2017.
- Published online 11 September 2017.
- Published first 24 May 2017.
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