- Correspondence to Willemijn MH Zijlstra, Center for Congenital Heart Diseases, Department of Pediatric Cardiology, Beatrix Children's Hospital, University Medical Center Groningen, P.O. Box 30.001, Groningen 9700 RB, The Netherlands;
- Received September 15, 2016
- Revised December 11, 2016
- Accepted December 19, 2016
- First published January 23, 2017.
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