- Correspondence to Professor Mark L Everard, Department of Respiratory Medicine, Sheffield Children's Hospital, Western Bank, Sheffield S10 2TH, UK;
- Received 31 July 2012
- Revised 5 October 2012
- Accepted 24 October 2012
- Published in print 1 January 2013.
- Published online 19 December 2012.
- Published first 22 November 2012.
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