Kennedy, S
Davies, E L
Ryan, L
Clegg, M E
Article History
Received: 6 December 2015
Revised: 19 July 2016
Accepted: 18 August 2016
First Online: 19 October 2016
Competing interests
: SK was funded by a Nigel Groome PhD research studentship from Oxford Brookes University. The remaining authors declare no conflict of interest.