Hammersley, Victoria S
Elton, Rob A
Walker, Samantha
Hansen, Christian H
Sheikh, Aziz
Article History
Received: 7 October 2013
Revised: 16 December 2013
Accepted: 9 February 2014
First Online: 5 June 2014
Competing interests
: SW is an Associate editor of, and AS is Joint Editor-in-Chief of, the PCRJ. Neither were involved in the editorial review of, nor the decision to publish, this article. All other authors declare no conflict of interest.