- Correspondence to Professor Thierry Troosters, Respiratory Rehabilitation and Respiratory Division, UZ Gasthuisberg, Herestraat 49 bus 706, Onderwijs & Navorsing I, Labo Pneumologie, Leuven B-3000, Belgium;
- Received June 14, 2016
- Revised November 14, 2016
- Accepted November 25, 2016
- First published January 30, 2017.
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