- Correspondence to Professor WA Helbing, Erasmus Medical Centre — Sophia Children's Hospital, Department of Paediatric Cardiology, Sp-2429, PO Box 2060, Rotterdam 3000 CB, The Netherlands;
- Received September 16, 2013
- Revised January 29, 2014
- Accepted February 6, 2014
- First published March 14, 2014.
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