1. Department of Cardiology, Academic Medical Center
2. Department of Vascular Medicine, Academic Medical Center
3. Department of Cardiology, Radboud University Nijmegen Medical Center
4. Department of Cardiology, University Medical Center Groningen
5. Department of Cardiology, University of Padua
6. Department of Clinical Epidemiology and Biostatistics, Academic Medical Center
7. Department of Paediatric Cardiology, University Medical Center Groningen
8. Department of Cardiology, University Medical Center Utrecht