1. From the Department of Biostatistics (G.H., S.E.J.), UAB School of Public Health, Birmingham, AL; Polish Mother Memorial Hospital Research Institute (M.B.), Lodz, Poland; Department of Neurology and Rehabilitation Medicine (B.K.), University of Cincinnati, OH; Department of Medicine (M.C.), University of Vermont, Burlington, VT; and Department of Epidemiology (P.M., V.J.H.), UAB School of Public Health, Birmingham, AL.