- Correspondence to Andrew Wragg Department of Cardiology, London Chest Hospital, Bonner Road, Bethnal Green, London E2 9JX, UK;
- Received 10 March 2012
- Accepted 7 May 2012
- Published in print 1 October 2012.
- Published online 5 September 2012.
- Published first 19 July 2012.
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