- Correspondence to Dr J Yserbyt, Respiratory Division, Department of Clinical and Experimental Medicine, University Hospitals Leuven, Herestraat 49, Leuven 3000, Belgium;
- Received 17 November 2016
- Revised 15 March 2017
- Accepted 27 March 2017
- Published in print 13 April 2017.
- Published online 14 April 2017.
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