1. Department of Pediatrics (Cardiology) Stanford University Palo Alto CA USA
2. Division of Pediatrics (Cardiology) Nationwide Children’s Hospital Columbus OH USA
3. Division of Pediatrics Cardiology Children’s Hospital at Montefiore Bronx NY USA
4. Department of Pediatrics (Cardiology) Vanderbilt University Medical Center Nashville TN USA
5. The Heart InstituteCincinnati Children’s Hospital Medical Center Cincinnati OH USA
6. Department of Paediatrics The Hospital for Sick Children Toronto ON USA