Haylock, Richard G. E.
Gillies, Michael
Hunter, Nezahat
Zhang, Wei
Phillipson, Mary
Article History
Received: 8 June 2017
Revised: 14 June 2018
Accepted: 25 June 2018
First Online: 15 August 2018
Competing interests
: The authors declare no competing interests.
: This work is published under the standard license to publish agreement. After 12 months the work will become freely available and the license terms will switch to a Creative Commons Attribution 4.0 International (CC BY 4.0).