Tsiligianni, Ioanna
Metting, Esther
van der Molen, Thys
Chavannes, Niels http://orcid.org/0000-0002-8607-9199
Kocks, Janwillem http://orcid.org/0000-0002-2760-0693
Article History
Received: 12 August 2015
Revised: 25 March 2016
Accepted: 27 April 2016
First Online: 21 July 2016
Competing interests
: IT, NC and JK are associate editors of npj Primary Care Respiratory Medicine, but were not involved in the editorial review of, nor the decision to publish this article. The other authors declare no conflict of interest.