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Authors
van den Bemt, Lisette
Wouters, Bram C W
Grootens, Joke
Denis, Joke
Poels, Patrick J
Schermer, Tjard R
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Article History
Received: 23 December 2013
Revised: 10 June 2014
Accepted: 27 June 2014
First Online: 14 August 2014
Competing interests
: The authors declare no conflict of interest. TRS 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.
