- Correspondence to Dr Rainer Kozlik-Feldmann, Department of Paediatric Cardiology, University Heart Center, University Medical Center Hamburg-Eppendorf, Martinistr. 52, Hamburg 20246, Germany;
- Received July 10, 2015
- Revised October 11, 2015
- Accepted October 14, 2015
- First published April 6, 2016.
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