1. From the Department of Internal Medicine (M.T., M.L.M., D.G., F.J.M., N.L.W.) and Free Radical and Radiation Biology Program, Department of Radiation Oncology (M.L.M., F.J.M., N.L.W.), University of Iowa, Iowa City; Veteran’s Administration Medical Center, Iowa City, Iowa (N.L.W.); Department of Internal Medicine (A.D.) and Graduate Center for Nutritional Sciences (L.A.C.), University of Kentucky, Lexington; and Department of Internal Medicine, University of Missouri, Columbia (K.C.D.).