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Contributors ABH conceived the study concept, collected and interpreted the data and wrote the draft; JL interpreted the data and edited the draft; RC collected and interpreted the data and edited the draft; AM interpreted the data and edited the draft; CH interpreted the data and edited the draft; MS interpreted the data; MH interpreted the data and edited the draft; RW interpreted the data and edited the draft; MC interpreted the data and edited the draft.
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 Views expressed in this article are the opinions of the authors and do not reflect current military doctrine or United States Department of Defense policy.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.