1 Division of Pediatric Cardiology, University of Virginia, Charlottesville, Virginia.
2 Divisions of Pediatric Cardiology and Pediatric Critical Care Medicine, Washington University School of Medicine, St. Louis, Missouri.
3 Children's Wisconsin, Division of Pediatric Cardiology, Medical College of Wisconsin, Milwaukee, Wisconsin.
4 Division of Pediatric Cardiology, Children's Hospital and Medical Center, Omaha, Nebraska.
5 Division of Pediatric Cardiology and Neonatology, Cambridge University Hospitals, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom.
6 Division of Neonatology, University of Virginia, Charlottesville, Virginia.
7 Division of Pediatric Cardiology and Division of Pediatric Critical Care Medicine, Ann & Robert H. Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
8 Cincinnati Children's Hospital, Division of Pediatric Cardiology, University of Cincinnati, Cincinnati, Ohio.