- Correspondence to Dr Maria-Jesus Cruz, Servei de Pneumologia Hospital Universitari Vall d’Hebron Passeig Vall d’Hebron, 119129, 08035 Barcelona, Spain;
- Received June 1, 2016
- Revised January 30, 2017
- Accepted February 10, 2017
- First published March 7, 2017.
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