1. Division of Pediatric Cardiology, Children's Hospital Los Angeles; University of Southern California Keck School of Medicine; Los Angeles California
2. Division of Pediatric Cardiology; Texas Children's Hospital, Baylor College of Medicine; Houston Texas
3. Division of Pediatric Cardiology; Children's Healthcare of Atlanta, Emory University School of Medicine; Atlanta Georgia
4. Department of Cardiac Surgery; Children's Hospital Boston, Harvard Medical School; Boston Massachusetts