1. Department of Diagnostic Imaging, Hospital for Sick Children, University of Toronto, Toronto, Canada.
2. Division of Cardiology, Department of Pediatrics, Labatt Family Heart Centre, Hospital for Sick Children, University of Toronto, Toronto, Canada.
3. Department of Cardiothoracic Surgery, Castle Hill Hospital, Cottingham, England, UK.
4. Division of Cardiovascular Surgery, Department of Surgery, Labatt Family Heart Centre, Hospital for Sick Children, University of Toronto, Toronto, Canada.