1. Pediatric and Adult Congenital Heart Centre, IRCCS-Policlinico San Donato, Milan, Italy
2. European Cardiology Society-Adult with Congenital Heart Disease Working Group
3. European Pediatric and Congenital Cardiology Association-Adult with Congenital Heart Disease Working Group
4. European Pediatric and Congenital Cardiology Association-Interventional Working Group
5. Division of Adult Congenital and Valvular Heart Disease, Department of Cardiovascular Medicine, University Hospital Muenster, Albert-Schweitzer-Campus 1, Muenster, Germany
6. Universitðtsklinik für Pädiatrie III, Medizinische Universität Innsbruck, Innsbruck, Austria
7. Department of Congenital Heart Disease—Paediatric Cardiology, Deutsches Herzzentrum Berlin, Berlin, Germany
8. Cardiovascular Diseases, University Hospitals Leuven, Leuven, Belgium
9. Klinik für Kinderkardiologie und angeborene Herzfehler, Deutsches Herzzentrum München, Technische Universität München, Munich, Germany
10. Department of Cardiology, The Heart Centre, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
11. European Association of Percutaneous Cardiovascular Interventions
12. Department of Cardiology, Erasmus Medical Center, Rotterdam, the Netherlands
13. Division of Pediatric and Adult Congenital Cardiology, Leeds General Infirmary, Leeds, UK