From the Departments of Community and Preventive Medicine (K.N., A.B., A.C.) and Neurology (S.R.S., R.G.H.), University of Rochester, Rochester, NY; Evergreen Neuroscience Institute (L.R.M.), Kirkland, WA; Jacobs Neurological Institute (B.W.-G.), SUNY University at Buffalo, Buffalo, NY; and Rand Corporation (A.W.D.), Pittsburgh, PA. Dr. Chappel is now at the Office of the Assistant Secretary for Planning and Evaluation, HSD HHS, Washington, DC. (At 2011-07-26)