- Correspondence to Professor Antoni Torres, Servei de Pneumologia, Hospital Clínic de Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), CIBER de Enfermedades Respiratorias (CIBERes), University of Barcelona, 08036 Barcelona, Spain;
- Received January 7, 2015
- Revised April 22, 2015
- Accepted April 26, 2015
- First published July 28, 2015.
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- Data supplement 1 - Online supplement
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