- Correspondence to Dr Trisha Vigneswaran, Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's and St Thomas’ NHS Trusts, Westminster Bridge Road, London SE1 7EH, UK;
- Received December 16, 2014
- Revised October 16, 2015
- Accepted November 4, 2015
- First published November 27, 2015.
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