- Correspondence to Dr Gregory J Skinner, Department of Paediatric Cardiology, Birmingham Children's Hospital, Steelhouse Lane, Birmingham, West Midlands B4 6NH, UK;
- Received 7 February 2013
- Revised 18 February 2013
- Accepted 20 February 2013
- Published in print 1 June 2013.
- Published online 13 May 2013.
- Published first 13 March 2013.
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