1. Cardiovascular Research Foundation; New York New York
2. Columbia University Medical Center; New York New York
3. Cardiovascular Systems, Inc.; St. Paul Minnesota
4. UCLA Medical Center; Los Angeles California
5. Morristown Medical Center; Morristown New Jersey
6. Hôpital du Sacré-Coeur de Montréal; Montreal Québec, Canada
7. Emory University/Atlanta VA Medical Center; Atlanta Georgia
8. St. Francis Hospital; Roslyn New York
9. Metropolitan Heart and Vascular Institute; Minneapolis Minnesota