- Correspondence to Dr Floris EA Udink ten Cate, Department of Paediatric Cardiology, Heart Centre Cologne, University Hospital of Cologne, Kerpener Str. 62, Cologne 50937, Germany;
- Received October 9, 2015
- Revised January 12, 2016
- Accepted March 3, 2016
- First published March 31, 2016.
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