1. From the Division of Periodontics (S.P.E., I.B.L., P.N.P.), Section of Oral and Diagnostic Sciences, School of Dental and Oral Surgery, Departments of Neurology (M.S.E., R.L.S.), College of Physicians and Surgeons, Columbia University Medical Center, Sergievsky Center, and Epidemiology (R.L.S.), Joseph P. Mailman School of Public Health, Columbia University, New York, NY; Division of Epidemiology, School of Public Health (R.T.D., M.D.) and Division of Infectious Diseases and International Medicine,...