1. Department Cardiovascular Sciences (KU Leuven), Congenital and Structural Cardiology (CSC UZ Leuven), Herestraat 49, B-3000 Leuven, Belgium
2. Department of Congenital Heart Disease, Evelina London Children's Hospital, Guy's and St. Thomas' NHS Foundation Trust, London, UK
3. Department of Adult Congenital Heart Disease, National Heart and Lung Institute, Imperial College London, Royal Brompton Hospital, London, UK
4. Department of Pediatric Cardiology, Pediatric Heart Center, University Children's Hospital Zurich, Zurich, Switzerland
5. Department of Adult Congenital Heart Disease, Guy's and St Thomas' Hospital and School of Biomedical Engineering and Imaging Sciences, Kings College, London, UK
6. Department of Cardiology, Erasmus Medical Center, Rotterdam, The Netherlands
7. Department of Pediatric Cardiology, Great Ormond Street Hospital, London, UK
8. Division of Cardiology, Labatt Family Heart Centre, Hospital for Sick Children and University of Toronto, SickKids, Ontario, Canada
9. Department of Paediatrics, University of Texas, Southwestern Medical Center, Dallas, TX, USA
10. Sussex Cardiac Centre, Brighton and Sussex University Hospitals, Brighton, UK
11. Cardiology Department, APHM, La Timone Hospital, Boulevard Jean Moulin, Marseille, France
12. Department of Cardiology, Oslo University Hospital, Rikshospitalet, University of Oslo, Oslo, Norway
13. Department of Cardiology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
14. Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
15. Department of Pediatrics, University Hospital, Lund, Sweden
16. Department of Cardiology, Hospital Universitari Vall d'Hebron, Barcelona, Spain
17. Department of Cardiology III—Adult Congenital and Valvular Heart Disease, University Hospital Muenster, Cardiology, Muenster, Germany