1. From the Central Arkansas Veterans Healthcare System, Little Rock (S.A., F.M., X.W., R.J.S.R., J.L.M.); Department of Geriatrics (S.A., R.J.S.R.), Division of Cardiology (F.M., X.W., S.V.S.P., J.L.M.), and Department of Biochemistry and Molecular Biology (S.G.M., A.J.T., R.J.S.R.), University of Arkansas for Medical Sciences (UAMS), Little Rock; and Department of Cardiology, University of Rome “Tor Vergata”, Rome, Italy (F.M., F.R.).