1. Department of Cardiology; Angiology, and Pulmology, University of Heidelberg; Heidelberg Germany
2. Center for Cardiac and Circulatory Diseases; Bruchsal Germany
3. Department of Pediatric Cardiology and Congenital Heart Disease; Deutsches Herzzentrum München, Technische Universität; Munich Germany
4. Klinik für Kinderkardiologie und angeborene Herzfehler, Deutsches Herzzentrum Berlin; Berlin Germany
5. Department of Paediatric Cardiology and Cardiac Surgery and Adult Congenital Heart Disease; IRCCS Policlinico San Donato; Milan 20097 Italy
6. Department of Congenital Heart Defects and Pediatric Cardiology; Heart Center, University of Freiburg; Freiburg Germany
7. Department of Cardiology-Research; Institute of Clinical Medicine, Aarhus University Hospital Skejby; Aarhus N DK-8200 Denmark
8. Department of Cardiology; Sussex Cardiac Centre; Brighton United Kingdom
9. Department of Cardiology; Karolinska University Hospital; Stockholm Sweden
10. Department of Congenital Cardiology; Leeds General Infirmary; Leeds United Kingdom
11. The Heart Centre, Rigshospitalet University Hospital; Copenhagen 2100 Denmark