1. From the Departments of Medicine (J.B.B., V.R.B., S.F., M.F.L.), Pathology (S.F.), and Pharmacology (M.F.L.), Vanderbilt University Medical Center, Nashville, Tenn, and the Division of Biological Sciences and Department of Nutrition (K.M., L.M., G.S.H.), Harvard School of Public Health, Boston, Mass.