- Correspondence to Dr Yvonne Heijdra, Department of Pulmonary Medicine, Radboud University Medical Center, PO BOX 9101, Nijmegen 6500 HB, The Netherlands;
- Received May 20, 2013
- Revised September 16, 2013
- Accepted October 9, 2013
- First published November 1, 2013.
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