1. Division of Cardiology, Department of Pediatrics, Wilhelmina Children’s Hospital, University of Utrecht, The Netherlands (H.B.G.).
2. Division of Cardiology, Department of Pediatrics, Centre Hospitalier de l’Université de Sherbrooke, University of Sherbrooke, QC, Canada (F.D.).
3. Department of Pediatrics, University Medical Center Groningen, University of Groningen, The Netherlands (I.M.V., M.J.E.v.d.A.).
4. The Labatt Family Heart Center, Department of Pediatrics, The Hospital for Sick Children and University of Toronto, ON, Canada (L.M., M.K.F.).