- Correspondence to Professor Timothy John Williams, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, SAF Building, South Kensington, London SW72AZ, UK;
- Received 25 June 2012
- Accepted 7 August 2012
- Published in print 1 December 2012.
- Published online 14 November 2012.
- Published first 30 August 2012.
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