- Correspondence to Dr James O Lindsay, Bart's Health NHS Trust, The Royal London Hospital, London E1 1BB, UK;
- Received 5 September 2016
- Revised 10 January 2017
- Accepted 24 January 2017
- Published in print 1 June 2017.
- Published online 12 May 2017.
- Published first 21 February 2017.
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