- Correspondence to Dr N E De Maeyer, Department of Respiratory Diseases, University Hospitals Leuven, Herestraat 49, Leuven 3000, Belgium;
- Received March 9, 2016
- Revised June 5, 2016
- Accepted June 7, 2016
- First published July 7, 2016.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.