1. Division of Cardiovascular Medicine Hospital of the University of Pennsylvania Philadelphia Pennsylvania
2. Division of Cardiology The Children's Hospital of Philadelphia Philadelphia Pennsylvania
3. Division of Cardiovascular Surgery Hospital of the University of Pennsylvania Philadelphia Pennsylvania
4. Division of Pulmonary, Allergy and Critical Care Medicine Hospital of the University of Pennsylvania Philadelphia Pennsylvania
5. Division of Cardiothoracic Surgery The Children's Hospital of Philadelphia Philadelphia Pennsylvania
6. Division of Cardiovascular Medicine Vanderbilt University Medical Center Nashville Tennessee