1. Centre for Inherited Cardiovascular Diseases, Great Ormond Street Hospital, London, UK
2. University College London Institute of Cardiovascular Science, London, UK
3. Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
4. Population, Policy and Practice Programme, UCL–Great Ormond Street Institute of Child Health, University College London, London, UK
5. Monaldi Hospital, Naples, Italy
6. Barts Heart Centre, St Bartholomew’s Hospital, London, UK