1. Department of Pediatric Cardiology Alder Hey Children's Hospital Liverpool UK
2. Department of Paediatric Medicine, Wendy Fitzwilliam's Childrens' Hospital Eric Williams Medical Sciences Complex Trinidad and Tobago West Indies
3. The Department of Pediatrics, Division of Cardiology, The Labatt Family Heart Center, The Hospital for Sick Children University of Toronto School of Medicine Toronto Ontario Canada
4. Ted Rogers Computational Program, Cardiovascular Data Management Centre, Ted Rogers Centre for Heart Research The Hospital for Sick Children Toronto Canada
5. Division of Cardiology Lucile Packard Children's Hospital Stanford Palo Alto California USA