- Correspondence to Dr David Metcalfe, Kadoorie Centre for Critical Care Research, John Radcliffe Hospital, Headley Way, Oxford OX3 9DU, UK;
- Received 11 May 2016
- Revised 30 June 2016
- Accepted 4 July 2016
- Published in print 1 December 2016.
- Published online 18 November 2016.
- Published first 27 October 2016.
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