1. Department of Biostatistics, University of Washington, Seattle, WA, 98195
2. Division of Epidemiology and Disease Control, University of Texas Health Sciences Center, Houston, TX, 77030
3. Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA, 98101
4. Department of Medicine and Epidemiology, Columbia University, New York, NY, 10032
5. Laboratory of Medicine and Pathology, University of Minnesota, Minneapolis, MN, 55455
6. Department of Pathology, University of Vermont, Colchester, VT, 05446
7. Cardiovascular Health Research Unit, Departments of Medicine and Epidemiology, University of Washington, Seattle, WA, 98101