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JB and BS are joint first authors.
JB and BS contributed equally.
Contributors JB conceptualised the project. JB and BS subsequently contributed equally to all aspects of the project and are joint first authors. TH provided guidance throughout and provided critical thought in drafting the manuscript. AN and GD assisted in data collection and manuscript preparation. JB and BS are guarantors for the overall content. All authors approved the final manuscript. Defence Professor of General Practice Surgeon Captain Katie King kindly provided advice for the project.
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.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.