From the Center on Aging (P.W.D., D.W., S.M.L.), and the Department of Preventative Medicine (D.W., S.M.L.), University of Kansas Medical Center, Kansas City, Kan; the Department of Veterans Affairs Medical Center, Kansas City, Mo (P.W.D., L.J.L.); the Department of Health Policy and Management (P.W.D.) University of Kansas, Overland Park, Kan; the Department of Psychology, University of Kansas, Lawrence, Kan (S.E.); and the Department of Statistics, Kansas State University (D.J.), Manhattan Kan.(1999-10時点)