Received: 10 November 2019
Accepted: 4 March 2020
First Online: 11 March 2020
Ethics approval and consent to participate
: This project met National Institute for Healthcare Research (NIHR, UK) criteria for service evaluation and formal ethical approval was therefore waived. All the data used for this study were routinely collected as part of standard prehospital and hospital patient data collection. The project was approved by the AAKSS Research & Development Committee. The study has been performed in accordance with the ethical standards laid down in the Declaration of Helsinki.
: Not Applicable
: All authors are employees of Air Ambulance Kent, Surrey and Sussex.