1. Division of Adult Congenital and Valvular Heart Disease, Department of Cardiovascular Medicine, University Hospital Muenster, Albert-Schweitzer-Campus 1, Muenster 48149, Germany
2. Cardiovascular Diseases, University Hospitals Leuven, Leuven, Belgium
3. Pediatric and Adult Congenital Heart Centre, IRCCS-Policlinico San Donato - University Hospital, Milan, Italy
4. National Centre for Cardiovascular Prevention and Outcomes, University College London, London, Great Britain
5. Klinik für Kinderkardiologie und angeborene Herzfehler, Deutsches Herzzentrum München, Technische Universität München, Munich, Germany
6. Department of Heart Failure, Lund University, Skane University Hospital, Lund, Sweden
7. Département de Cardiologie, Hôpital Européen Georges-Pompidou, Paris, France
8. Department Cardiology and Pediatrics, University Medical Center Utrecht, Utrecht, Netherlands
9. Universitðklinik für Pädiatrie III, Medizinische Universität Innsbruck, Innsbruck, Austria
10. Pediatric Cardiac Centre, Hungarian Institute of Cardiology, Budapest, Hungary
11. Groupe médical du Petit-Lancy, Geneva, Switzerland
12. Heart Hospital, University College London Hospitals NHS Trust, London, Great Britain