1. Johns Hopkins All Children's Heart Institute Johns Hopkins All Children's Hospital St. Petersburg Florida USA
2. Division of Cardiology, Department of Pediatrics, The Hospital for Sick Children University of Toronto Toronto Ontario Canada
3. Division of Cardiovascular Surgery, Department of Pediatrics, The Hospital for Sick Children University of Toronto Toronto Ontario Canada
4. Department of Pediatrics Oregon Health & Science University Portland Oregon USA
5. The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and Gynecology, Mount Sinai Hospital University of Toronto Toronto Ontario Canada
6. Division of Clinical and Metabolic Genetics, Department of Pediatrics, The Hospital for Sick Children University of Toronto Toronto Ontario Canada