1. Cardiovascular Division, Department of MedicineUniversity of Mississippi Medical Center Jackson Mississippi
2. Cardiovascular Division, Department of MedicineHenry Ford Hospital Detroit Michigan
3. Cardiovascular Division, Department of MedicineVanderbilt University Medical Center Nashville Tennessee
4. Cardiovascular Division, Department of MedicineDuke University Durham North Carolina
5. Cardiology DivisionChildren's Hospital of Philadelphia Philadelphia Pennsylvania
6. Department of MedicineVanderbilt University Medical Cente Nashville Tennessee