1. From the Department of Medicine (M.D.L., G.R.S., C.A.H.) and Division of Cardiology (G.R.S., C.A.H.), Hennepin County Medical Center and University of Minnesota, Minneapolis; and Cardiovascular Special Studies Center, United States Renal Data System, Minneapolis Medical Research Foundation, Minneapolis, MN (S.D., D.T.G., C.A.H.).