Kendall, Marilyn
Buckingham, Susan
Ferguson, Susie
Hewitt, Ninian
Pinnock, Hilary
Article History
First Online: 31 July 2014
Competing interests
: HP is an Associate editor of <i>npj Primary Care Respiratory Medicine</i>, but was not involved in the editorial review of, nor the decision to publish, this article. The remaining authors declare no conflict of interest.