Gillis, R. M. E.
van Litsenburg, W.
van Balkom, R. H.
Muris, J. W.
Smeenk, F. W.
Article History
Received: 4 November 2016
Revised: 1 February 2017
Accepted: 17 March 2017
First Online: 19 May 2017
Competing interests
: F.S. and R.v.B. are pulmonologists and W.v.L. is a specialised nurse working at the department where the study was conducted.