1. Division of Pediatric Cardiology, Department of Pediatrics; University of Tennessee Health Science Center, LeBonheur Children's Hospital; Memphis Tennessee
2. Division of Pediatric Cardiology, Department of Pediatrics, The Lillie Frank Abercrombie Section of Cardiology; Texas Children's Hospital, Baylor College of Medicine; Houston Texas
3. Division of Pediatric Cardiology, Department of Pediatrics; A.I. Dupont Hospital For Children; Wilmington Delaware