- Correspondence to Dr C Rodrigo, Nottingham University Hospitals NHS Trust, Department of Respiratory Medicine, David Evans Building, City Campus, Hucknall Road, Nottingham NG5 1PB, UK;
- Received December 6, 2013
- Revised June 30, 2014
- Accepted July 3, 2014
- First published July 30, 2014.
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