- Correspondence to Professor Jürgen Hörer, Department of Pediatric Cardiology and Congenital Heart Disease, Hopital Marie Lannelongue, Université Paris-Sud, 92350 Le Plessis Robinson, France;
- Received 9 August 2017
- Revised 17 October 2017
- Accepted 6 November 2017
- Published online 1 December 2017.
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