- 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 November 29, 2011
- Accepted December 11, 2011
- First published January 20, 2012.
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