- Correspondence to Dr Ramon Orriols, Servei de Pneumologia, Hospital Universitari Vall d'Hebron, Passeig Vall d'Hebron, 119-129, 08035 Barcelona, Catalonia, Spain;
- Received September 25, 2012
- Revised April 4, 2013
- Accepted April 20, 2013
- First published May 21, 2013.
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