- Correspondence to Capt Iain T Parsons, Department of Critical Care, Royal Brompton Hospital, Royal Brompton and Harefield NHS Foundation Trust, Sydney Street, London SW3 6NP, UK;
- Received October 12, 2014
- Revision received March 26, 2015
- Accepted April 16, 2015
- First published June 4, 2015.
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