1. From the Department of Medicine (T.S., N.A.Z., M.M.L., M.C.), University of Vermont College of Medicine, Burlington; Collaborative Health Studies Coordinating Center (R.K.), Department of Biostatistics, University of Washington, Seattle; Department of Pathology (N.S.J.), University of Vermont College of Medicine, Burlington; and Department of Medicine (J.I.B.), Emory University, Atlanta, Ga.