- 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 14 June 2016
- Revised 14 November 2016
- Accepted 25 November 2016
- Published online 30 January 2017.
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