1. Pediatrics, Division of Cardiology Stollery Children's Hospital, University of Alberta Edmonton Alberta Canada
2. Pediatrics, Division of Cardiology Children's Hospital at Montefiore Bronx New York USA
3. Pediatrics, Division of Cardiology Cleveland Clinic Children's Cleveland Ohio USA
4. Pediatrics, Division of Cardiology University of Colorado, Denver Anschutz Medical Campus, Children's Hospital Colorado Aurora Colorado USA