Spear, Abigail M.
Lawton, Graham
Staruch, Robert M. T.
Rickard, Rory F.
Article History
Received: 9 October 2017
Revised: 19 June 2018
Accepted: 24 July 2018
First Online: 21 August 2018
Competing interests
: All authors are employed by the Armed Forces of the United Kingdom or the Ministry of Defence and declare no competing interests.