Johns, Louise E
Jones, Michael E
Schoemaker, Minouk J
McFadden, Emily
Ashworth, Alan
Swerdlow, Anthony J
Article History
Received: 22 February 2018
Revised: 15 June 2018
Accepted: 15 June 2018
First Online: 17 October 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).