1. Department of Orthopaedics, Rehabilitation and Physical therapy, Leiden University Medical Center, Leiden, The Netherlands
2. Basalt Revalidatie, Leiden, The Netherlands
3. Department of Pediatrics, Division of Pediatric Cardiology, Amsterdam University Medical Center, Amsterdam, The Netherlands
4. Department of Pediatrics, Division of Pediatric Cardiology, Leiden University Medical Center, Leiden, The Netherlands