1. Division of Cardiology Duke University School of Medicine and Duke Clinical Research Institute Durham NC
2. Division of Cardiology University of Colorado School of Medicine Aurora CO
3. Division of Cardiology Massachusetts General Hospital Boston MA
4. Department of Medicine UCLA School of Medicine Los Angeles CA
5. Division of Cardiology University of Utah School of Medicine Salt Lake City UT
6. Division of Cardiology Vanderbilt University School of Medicine Nashville TN
7. Merck Research Laboratories Rahway NJ
8. Division of Cardiology Texas Heart Institute Houston TX