1. Cardiac Arrhythmia Service; Massachusetts General Hospital and Harvard Medical School; Boston Massachusetts
2. Cardiovascular Research Center; Massachusetts General Hospital and Harvard Medical School; Boston Massachusetts
3. Hematology-Oncology Division; Beth Israel Deaconess Medical Center; Boston Massachusetts
4. Veterans Affairs Boston Healthcare System; Boston Massachusetts
5. Framingham Heart Study; Department of Medicine; School of Medicine; Framingham Massachusetts
6. Department of Epidemiology; School of Public Health; Boston University; Framingham Massachusetts
7. Department of Medicine; Alpert Medical School; Brown University; Providence Rhode Island
8. Health Services Policy and Practice; Alpert Medical School; Brown University; Providence Rhode Island
9. New England Geriatric Research; Education and Clinical Center; Boston Massachusetts
10. Division of Cardiovascular Medicine; Brigham and Women's Hospital; Boston Massachusetts
11. Department of Medicine; Harvard Medical School; Boston Massachusetts
12. Department of Neurology; Massachusetts General Hospital and Harvard Medical School; Boston Massachusetts
13. Helmsley Electrophysiology Center; The Cardiovascular Institute; Mount Sinai School of Medicine; New York New York
14. General Medicine Division; Massachusetts General Hospital and Harvard Medical School; Boston Massachusetts