1. Centre for Inherited Cardiovascular Diseases, Great Ormond Street Hospital, London WC1N 3JH, UK
2. Institute of Cardiovascular Sciences, University College London, London WC1E 6BT, UK
3. Paediatric Cardiology Department, Royal Brompton and Harefield Hospitals, Guy’s and St. Thomas’ NHS Foundation Trust, London SW3 5NP, UK
4. Dipartimento di Scienze Cardio-Toraco-Vascolari e Sanità pubblica, University Hospital of Padua, 35128 Padua, Italy
5. Department of Cardiology, San Giovanni Battista Hospital, 06034 Foligno, Italy
6. Department of Cardiology, Leiden University Medical Center, 2300 Leiden, The Netherlands
7. Adult Congenital Heart Disease Unit, A.O. dei Colli, Monaldi Hospital, 80131 Naples, Italy
8. Experimental and Clinical Medicine Department, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy
9. Division of Paediatric Cardiology, Department of Women and Children’s Health, University Hospital of Padua, 35128 Padua, Italy
10. Adult Congenital Heart Centre and National Centre for Pulmonary Hypertension, Royal Brompton Hospital, Guy’s and St. Thomas’s NHS Foundation Trust, London SW3 5NP, UK
11. CMR Unit, Cardiology Department, Royal Brompton and Harefield Hospitals, Guy’s and St. Thomas’ NHS Foundation Trust, London SW3 5NP, UK
12. National Heart and Lung Institute, Imperial College London, London SW3 6LY, UK
13. Department of Echocardiography, Royal Brompton and Harefield Hospitals, Guy’s and St. Thomas’ NHS Foundation Trust, London SW3 5NP, UK
14. Centro Cardiologico Monzino, IRCCS, 20138 Milan, Italy
15. Department of Clinical Sciences and Community Health, Cardiovascular Section, University of Milan, 20122 Milan, Italy
16. Clinical Pathways and Epidemiology Unit, Bambino Gesù Children’s Hospital IRCCS, 00165 Rome, Italy
17. Division of Cardiology and Cardio Lab, Department of Clinical Science and Translational Medicine, University of Rome Tor Vergata, 00133 Rome, Italy