- Correspondence to Dr Michael C Steiner, Department of Respiratory Medicine, Institute for Lung Health, University Hospitals of Leicester NHS Trust, Glenfield Hospital, Groby Road, Leicester LE3 9QP, UK;
- Received September 22, 2012
- Revised January 23, 2013
- Accepted March 7, 2013
- First published March 27, 2013.
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