1. The Cardiac Center at the Children’s Hospital of Philadelphia; University of Pennsylvania School of Medicine; Philadelphia Pennsylvania
2. The Lillie Frank Abercrombie Section of Cardiology, Texas Children’s Hospital; Baylor College of Medicine; Houston Texas
3. The Heart Institute, Cincinnati Children’s Hospital Medical Center; University of Cincinnati College of Medicine; Cincinnati Ohio
4. Sibley Heart Center Cardiology, Children’s Healthcare of Atlanta; Emory University School of Medicine; Altanta Georgia
5. Center for Pediatric Clinical Effectiveness; Children’s Hospital of Philadelphia; Philadelphia Pennsylvania