1. Department of Pediatric Cardiology, Stollery Children's Hospital University of Alberta Edmonton Alberta Canada
2. Department of Pediatric Cardiology, Keck School of Medicine of USC Children's Hospital Los Angeles Los Angeles California USA
3. Division of Pediatric Cardiology, Department of Pediatrics, LHSC Children's Hospital Western University London Ontario Canada
4. Department of Pediatric Cardiology, Lucile Packard Children's Hospital Stanford University Palo Alto California USA