1. Division of Cardiology Baylor College of Medicine Houston Texas USA
2. Department of Internal Medicine Rochester General Hospital Rochester New York USA
3. Department of Internal Medicine University of Missouri Kansas City Kansas City Missouri USA
4. Warren Alpert Medical School of Brown University Providence Rhode Island USA
5. Division of Cardiovascular Medicine Mayo Clinic Rochester Minnesota USA
6. Division of Cardiovascular Medicine, Department of Medicine Lahey Hospital and Medical Center Burlington Massachusetts USA