- Correspondence to Dr Rachel C Amos, Whittington Hospital, Magdala Avenue, London N19 5NF, UK;
- Received 2 September 2016
- Revised 30 December 2016
- Accepted 10 January 2017
- Published in print 1 August 2017.
- Published online 19 July 2017.
- Published first 8 February 2017.
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