- Correspondence to Dr James Vassallo, Institute of Naval Medicine, Alverstoke, Gosport PO12 2DL, UK;
- Received 1 June 2017
- Revision received 31 August 2017
- Accepted 1 September 2017
- Published in print 4 December 2017.
- Published online 5 December 2017.
- Published first 21 October 2017.
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