1. Department of Cardiovascular MedicineUniversity of Texas Medical Branch Galveston Texas
2. Division of Cardiology, Massachusetts General Hospital and Harvard Medical School Boston MA
3. Division of Cardiovascular MedicineUniversity of Iowa Iowa City Iowa
4. Cardiovascular Institute, The Warren Alpert Medical School of Brown University, Providence RI USA
5. Department of Internal MedicineRochester General Hospital Rochester New York
6. Department of Cardiovascular MedicineUniversity of Kentucky Lexington Kentucky
7. Division of Cardiovascular MedicineBaylor School of Medicine Houston Texas