1. Cardiology Division; University of Rochester Medical Center; Rochester New York
2. Cardiac Arrhythmia Service; Massachusetts General Hospital and Harvard Medical School; Boston Massachusetts
3. Hadassah Ein Kerem Medical Center; Hebrew University, Hadassah Medical School; Jerusalem Israel
4. Department of Medicine, Feinberg School of Medicine; Northwestern University; Chicago Illinois
5. Brigham and Women's Hospital; Harvard Medical School; Boston Massachusetts