- Correspondence to Dr François Maltais, Centre de Pneumologie, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Ste-Foy, Québec, QC, G1V 4G5, Canada;
- Received 18 December 2009
- Accepted 29 June 2010
- Published online 21 October 2010.
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