1. Departments of Pediatrics; Division of Pediatric Cardiology; Sophia Children's Hospital; Erasmus University Medical Center; Rotterdam The Netherlands
2. Departments of Pediatrics; Division of Pediatric Cardiology; Beatrix Children's Hospital; University Medical Center Groningen; Groningen The Netherlands
3. Departments of Pediatrics; Division of Pediatric Cardiology; Leiden University Medical Center; Leiden The Netherlands
4. Departments of Pediatrics; Division of Pediatric Cardiology; Wilhelmina Children's Hospital; University Medical Center Utrecht; Utrecht The Netherlands
5. Departments of Pediatrics; Division of Pediatric Cardiology; Radboud University Medical Center; Nijmegen The Netherlands
6. Departments of Pediatrics; Division of Pediatric Cardiology; Emma Children's Hospital; Academic Medical Center; Amsterdam The Netherlands
7. Departments of Pediatrics; Division of Pediatric Cardiology; Free University Medical Center; Amsterdam The Netherlands