1. From the Department of Rehabilitation Medicine, State University of New York at Buffalo (G.E.G.); the Department of Neurology, School of Medicine, Boston University (P.A.W., M.K.H., C.S.K.), the Section of Preventive Medicine and Epidemiology, Evans Memorial Department of Clinical Research and Department of Medicine, Boston Medical Center (P.A.W.), Boston University School of Public Health (A.B.) and Department of Mathematics, Boston University (R.B.D.), Boston, Mass; and The Framingham Study of the...