1. San Francisco Department of Pediatrics, Division of Pediatric Cardiology The University of California
2. Division of Pediatric Cardiology, Department of Pediatrics Stanford University School of Medicine
3. Division of Pediatric Cardiology, Department of Pediatrics University of Virginia
4. Rainbow Babies and Children's Hospital Division of Pediatric Cardiology University Hospitals Cleveland Ohio
5. Division of Cardiology, Departments of Pediatrics The Children's Hospital of Philadelphia
6. University of Utah and Primary Children's Hospital