- Correspondence to Joanna Shaw, Clinical Audit and Research Unit, London Ambulance Service NHS Trust Pocock, HQ Annexe, 8-20 Pocock Street, London SE1 0BW, UK;
- Received June 6, 2016
- Revised February 20, 2017
- Accepted March 25, 2017
- First published May 13, 2017.
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