1. Centre for Inherited Cardiovascular Diseases, Department of Cardiology Great Ormond Street Hospital London UK
2. Institute of Cardiovascular Science University College London London UK
3. The Heart Unit Birmingham Children's Hospital Birmingham UK
4. Children's Heart Unit University Hospital of Wales Cardiff UK
5. Department of Paediatric Cardiology Royal Brompton and Harefield NHS Trust London UK
6. Department of Paediatric Cardiology Bristol Royal Hospital for Children Bristol UK
7. Department of Paediatric Cardiology Royal Hospital for Children Glasgow UK
8. Department of Paediatric Cardiology Southampton General Hospital Southampton UK
9. Department of Paediatric Cardiology Leeds General Infirmary Leeds UK
10. Department of Paediatric Cardiology Glenfield Hospital Leicester UK
11. Department of Cardiology Alder Hey Children's Hospital Liverpool UK
12. Children's Heart Service Evelina Children's Hospital London UK
13. Department of Paediatric Cardiology John Radcliffe Hospital Oxford UK
14. Department of Paediatric Cardiology The Freeman Hospital Newcastle UK
15. The Children's Heart Centre Our Lady's Children's Hospital Dublin Ireland