1. Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania.
2. Division of Cardiovascular Medicine, Division of Cardiology, Department of Medicine, Cedars-Sinai Research Institute, Cedars-Sinai Medical Center, Los Angeles, California.
3. Department of Statistics, College of Medicine, University of Florida, Gainesville, Florida.
4. Department of Health Behavior and Health Education, College of Public Health, University of Arkansas for Medical Sciences, Little Rock, Arkansas.
5. Allegheny General Hospital, Pittsburgh, Pennsylvania.
6. Center for Clinical Pharmacology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.