1. From the Division of Epidemiology (M.D., R.T.D., D.R.J.), School of Public Health, and Department of Medicine (M.D.), Medical School, University of Minnesota, Minneapolis, Minn; Departments of Neurology (T.R., B.B.-A., R.L.S.), Columbia University College of Physicians and Surgeons and Sociomedical Sciences (B.B.-A.) and Epidemiology (M.D., R.L.S.), Mailman School of Public Health, Columbia University, New York, NY; and Division of Periodontics (P.N.P.), Columbia University School of Dental and Oral...