1. Advanced Heart Disease Section, Cedars-Sinai Heart Institute; Los Angeles CA
2. Division of Cardiovascular Medicine, University of Wisconsin; Madison WI
3. Division of Cardiology, Duke University; Durham NC
4. Division of Cardiothoracic Surgery, Emory University; Atlanta GA
5. Cardiovascular Division, University of Minnesota; Minneapolis MN
6. United Network for Organ Sharing; Richmond VA
7. Department of Cardiovascular and Thoracic Surgery, University of Texas Southwestern; Dallas TX
8. Division of Cardiology, Department of Paediatrics, University of Toronto; Toronto Ontario Canada
9. Cardiovascular Services Division, Minneapolis Heart Institute; Minneapolis MN
10. Division of Cardiology, University of Pittsburgh; Pittsburgh PA
11. Division of Cardiology, Columbia University Medical Center; New York NY
12. Department of Pediatrics, Vanderbilt University; Nashville TN