- Correspondence to Professor Lieven Dupont, Department of Respiratory Medicine, University Hospitals Leuven, KU Leuven, 49 Herestraat, Leuven B-3000, Belgium;
- Received January 18, 2013
- Revised May 7, 2013
- Accepted May 30, 2013
- First published July 2, 2013.
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