McKibben, Shauna
Bush, Andy
Thomas, Mike
Griffiths, Chris
Article History
Received: 13 November 2016
Revised: 24 March 2017
Accepted: 28 March 2017
First Online: 26 April 2017
Competing interests
: CG is an Assistant Editor of npj Primary Care Respiratory Medicine and MT is an Associate Editor of npj Primary Care Respiratory Medicine but were involved in neither the editorial review of, nor any decision to publish or not publish this article.