- Correspondence to Graham McClelland, Research and Development Department, North East Ambulance Service NHS Foundation Trust, Bernicia House, Goldcrest Way, Newburn Riverside, Newcastle Upon Tyne NE15 8NY, UK;
- Received April 7, 2014
- Revised November 30, 2014
- Accepted December 15, 2014
- First published January 8, 2015.
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