- Correspondence to Dr A Ryding, Department of Cardiology, Norfolk and Norwich University Hospital, Colney Lane Norwich, NR47UY UK;
- Received 13 February 2013
- Revised 16 April 2013
- Accepted 21 May 2013
- Published in print 15 December 2013.
- Published online 20 November 2013.
- Published first 13 June 2013.
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