1. Baylor College of Medicine; Department of Pediatrics, Division of Cardiology and Congenital Heart Surgery; Houston Tex USA
2. Sibley Heart Center Cardiology and Emory University School of Medicine; Atlanta GA USA
3. The Heart Institute; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio USA
4. Columbia University College of Physicians and Surgeons; Department of Pediatrics, Division of Cardiology; New York NY USA
5. University of Pennsylvania School of Medicine; Department of Pediatrics, Divisions of Pediatric Cardiology and Critical Care Medicine; Philadelphia Pa USA