- Correspondence to Dr Paolo Spagnolo, Department of Medical and Surgical Sciences for Children and Adults, Center for Rare Lung Diseases, University Hospital, via del Pozzo 71, Modena 41124, Italy;
- Received January 16, 2013
- Revised February 18, 2013
- Accepted February 25, 2013
- First published March 22, 2013.
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