1. Division of Cardiovascular Medicine and Clinical Pharmacology, Vanderbilt University School of Medicine, Nashville, TN (D.M.R.).
2. Department of Medicine, Stanford University, CA (R.A.H.).
3. Cardiology Division, Brown University School of Medicine, Providence, RI (A.P.).
4. Electrophysiology and Arrhythmia Services, Cooper University Hospital, Camden, NJ (A.M.R.).
5. Clinical Cardiac Electrophysiology Fellowship Program, Cooper Medical School of Rowan University, Camden, NJ (A.M.R.).