- Correspondence to Louis-Philippe Boulet, Department of Pneumology, Institut universitaire de cardiologie et de pneumologie de Québec, 2725, Chemin Ste-Foy, Québec, Quebec, Canada, G1V 4G5;
- Received 29 November 2011
- Accepted 11 December 2011
- Published online 5 April 2012.
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