- Correspondence to Dr Ferran Barbé, LleidaRespiratory Department, Hospital Universitari Arnau de Vilanova-Santa María, IRB Lleida, Lleida, 25198, Spain;
- Received October 31, 2017
- Revised June 13, 2018
- Accepted June 25, 2018
- First published July 31, 2018.
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