- Correspondence to Floris-Jan S Ridderbos, Center for Congenital Heart Diseases, Department of Paediatric Cardiology, Beatrix Children's Hospital, Universitair Medical Center Groningen, Groningen 9713 GZ, The Netherlands;
- Received February 24, 2019
- Revised June 26, 2019
- Accepted July 3, 2019
- First published September 6, 2019.
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