- Correspondence to Professor Alvar Agusti, Thorax Institute, Hospital Clinic, University of Barcelona, IDIBAPS, Villarroel 170, Escala 3, Planta 5, Barcelona 08036, Spain and and FISIB, CIBER Enfermedades Respiratorias Mallorca, Spain;
- Received December 5, 2012
- Accepted December 6, 2012
- First published January 7, 2013.
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