- Correspondence to Professor E R Chilvers, Respiratory Medicine Division, Department of Medicine, University of Cambridge School of Clinical Medicine, Box 157, Addenbrooke's Hospital, CUHNHSFT, Hills Road, Cambridge CB2 0QQ, UK;
- Received October 23, 2013
- Revised March 10, 2014
- Accepted March 14, 2014
- First published April 4, 2014.
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