From the authors

Eur Respir J. 2014 Jul;44(1):262-3. doi: 10.1183/09031936.00029614.

¹ Departamento de Investigación en Tabaquismo y EPOC, Instituto Nacional de Enfermedades Respiratorias Ismael Cosio Villegas, Mexico DF, Mexico.
² James Hogg Research Center, University of British Columbia, Vancouver, BC Dept of Physical Therapy, University of British Columbia, Vancouver, BC pat.camp@hli.ubc.ca.
³ James Hogg Research Center, University of British Columbia, Vancouver, BC Dept of Medicine, University of British Columbia, Vancouver, BC.
⁴ James Hogg Research Center, University of British Columbia, Vancouver, BC Dept of Radiology, University of British Columbia, Vancouver, BC, Canada.

No abstract available

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