1. From the Emory University Division of Cardiology, Department of Medicine and the Atlanta Veterans Administration Hospital (J.D.W., T.J.G., C.F.H.M., R.E.C., S.I.D., K.K.G., D.P.J., D.G.H.), Ga; and Monash University, Department of Pharmacology & Centre for Vascular Health (H.H.H.W.S.), Melbourne, Australia.