Morgan, C J A
Freeman, T P
Powell, J
Curran, H V
Article History
Received: 23 July 2015
Revised: 20 October 2015
Accepted: 9 November 2015
First Online: 16 February 2016
Competing interests
: CJAM has consulted for Janssen and GlaxoSmithKline and received compensation. The remaining authors declare no conflict of interest.