- Correspondence to Dr Dirk-Jan Slebos, Department of Pulmonary diseases AA11, University Medical Center Groningen, University of Groningen, PO Box 30001, Groningen 9700 RB, The Netherlands;
- Received January 31, 2014
- Revised May 10, 2014
- Accepted May 12, 2014
- First published June 2, 2014.
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