- 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 6 June 2016
- Revised 20 February 2017
- Accepted 25 March 2017
- Published online 13 May 2017.
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