- Correspondence to Dr Nick A Maskell, Academic Respiratory Unit, University of Bristol, Second Floor, Learning and Research Building, Southmead Hospital, Westbury-on-Trym, Bristol BS10 5NB, UK;
- Received September 23, 2013
- Revised November 12, 2013
- Accepted November 21, 2013
- First published December 16, 2013.
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