1. From the Department of Pathology (N.S.J.), College of Medicine, University of Vermont, Burlington; the Department of Biostatistics (A.M.A.), University of Washington, Seattle; the Department of Epidemiology (L.H.K.), University of Pittsburgh School of Public Health, Pa; the Department of Biochemistry (R.P.T.), University of Vermont, Burlington; and the Departments of Medicine, Epidemiology, and Health Services (B.M.P.), Cardiovascular Health Research Unit, University of Washington, Seattle.