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Contributors TFH wrote the initial draft of the paper adapting it from a Faculty for Defence Healthcare Engagement newsletter article he wrote, with revisions and additions made by DAR.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Disclaimer The opinions expressed here are those of the authors and do not necessarily represent the views of the UK Defence Medical Services.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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