1. Cincinnati Children's Hospital Medical Center; Cincinnati Ohio USA
2. University of Louisville; Louisville Kentucky USA
3. KU Leuven; Leuven Belgium
4. University of Gothenburg; Gothenburg Sweden
5. Amsterdam Medical Center; Amsterdam The Netherlands
6. Chiba Cardiovascular Center; Chiba Japan
7. Umeå University; Umeå Sweden
8. National Taiwan University; Taipei Taiwan
9. Adult Congenital Heart Unit, Sahlgrenska University Hospital; Gothenburg Sweden
10. Frontier Lifeline Hospital, Dr. K. M. Cherian Heart Foundation; Chennai India
11. Nationwide Children's Hospital; Columbus Ohio USA
12. University Hospitals Leuven and Department of Cardiovascular Sciences; Leuven Belgium
13. Oregon Health & Science University; Portland Oregon USA
14. Hospital Louis Pradel; Lyon France
15. Oslo University Hospital; Oslo Norway
16. University Hospital Bern, University of Bern; Bern Switzerland
17. University West; Trollhättan Sweden
18. Hospital de Niños; Córdoba Argentina
19. IRCCS Policlinico San Donato Hospital; Milan Italy
20. Stanford University; Palo Alto California USA
21. Mater Dei Hospital; Msida Malta
22. Monash Medical Center; Melbourne Australia
23. Helen DeVos Children's Hospital; Grand Rapids Michigan USA
24. University of Alberta; Edmonton Canada
25. Washington University and Barnes Jewish Heart & Vascular Center, University of Missouri; Saint Louis Missouri USA
26. Montreal Heart Institute; Montreal Canada
27. Children's Hospital & Medical Center; Omaha Nebraska USA