1. From the Division of Cardiology and Departments of Medicine and Radiology (P.R., A.B.), Emory University School of Medicine, Atlanta, Ga; the Department of Nephrology (A.B.), Ospedale San Paolo and University of Milan, Milan, Italy; the Department of Nephrology (E.F.), Ospedale Malpighi and University of Bologna, Bologna, Italy; Denver Nephrology (G.A.B.), professional corporation, Denver, Colo; and the Department of Epidemiology (P.M.), Tulane University, New Orleans, La.