1. Department of Epidemiology, School for Public Health and Primary Care (CAPHRI), Maastricht University, The Netherlands
2. Child Development & Exercise Centre, Wilhelmina Children’s Hospital, University Medical Centre Utrecht, The Netherlands
3. Department of Paediatrics, Division of Paediatric Cardiology, Erasmus MC, Sophia Children's Hospital, Rotterdam, The Netherlands
4. Department of Paediatric Cardiology, Leiden University Medical Centre, The Netherlands