- Correspondence to Dr Thierry Troosters, Respiratory Rehabilitation and Respiratory Division, UZ Gasthuisberg, Herestraat 49 bus 706, Onderwijs & Navorsing I, Labo Pneumologie, Leuven B-3000, Belgium;
- Received March 8, 2013
- Accepted March 22, 2013
- First published April 20, 2013.
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