1. Department of Medicine, Division of Cardiology, University of California, Irvine Medical Center, Orange, California; University of California, Irvine Medical Center, Division of Cardiology, Building 53, Route 81, Rm 100, 101 The City Drive South, Orange, CA 92868- 4080;
2. Department of Medicine, Division of Cardiology, University of California, Irvine Medical Center, Orange, California
3. Department of Medicine, University of South Carolina School of Medicine, Columbia, South Carolina