McDonnell, Juliet
Correia de Sousa, Jaime
Baxter, Noel
Pinnock, Hilary
Román-Rodríguez, Miguel
van der Molen, Thys
Williams, Sian
Article History
Received: 27 March 2014
Revised: 20 July 2014
Accepted: 20 July 2014
First Online: 25 September 2014
Competing interests
: JCDeS and HP are Associate Editors of <i>npj Primary Care Respiratory Medicine</i>, but were not involved in the editorial review of, nor the decision to publish, this article. The remaining authors declare no conflicts of interest.