From the Departments of Neurological Surgery (C.L.M., J.B., J.P., B.S., N.R.T.), Neurology (C.P.), and Psychiatry (J.R.F.), School of Medicine, and Department of Biostatistics (N.R.T.), School of Public Health, University of Washington, Seattle; and Center for Clinical Studies (A.M.J.), Washington University School of Medicine, St. Louis, MO.