1. From the Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor (C.S.)
2. Division of Cardiovascular Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor (D.S., M.S., H.S.G.)
3. Division of Cardiology, Spectrum Health, Grand Rapids, MI (D.W.)
4. Department of Cardiovascular Medicine, Beaumont Hospital, Royal Oak, MI (S.R.D.)
5. Grand Traverse Heart Associates, Department of Cardiology, Traverse Heart and Vascular, Traverse City, MI (N.K.S.)
6. Division of Cardiology, Department of Internal Medicine, VA Ann Arbor Healthcare System, MI (H.S.G.).