1. From the Departments of Preventive Medicine (A.P.-H.), Neurology (E.L., G.F., M.P.B., K.R., S.F.A., M.F.), and Medicine (P.N.R.H.) of the Keck School of Medicine of the University of Southern California, Los Angeles. S.F.A. is currently at the Institute for Neurological Research, FLENI, Buenos Aires, Argentina; P.N.R.H. is currently at the Nichols Institute, Quest Diagnostics, San Juan Capistrano, Calif; and M.F. is currently at the Departments of Neurology and of Anatomy and Neurobiology,...