1. Department of Internal Medicine, Section of Cardiovascular Medicine, Yale University School of Medicine, New Haven, Connecticut
2. Yale University School of Nursing, New Haven, Connecticut
3. Hartford Hospital, Hartford, Connecticut
4. University of Alabama, Birmingham, Alabama
5. University of Virginia, Charlottesville, Virginia
6. University of Montreal, Montreal, Quebec, Canada
7. University of Rochester, Rochester, New York
8. Cardiology Consultants, Calgary, Alberta, Canada
9. Medstar Research Institute, Washington, DC