1. From the Clinical Epidemiology Research and Training Unit (S.C.V., D.T.F.), Arthritis Center (S.C.V., D.T.F.), and Departments of Neurology, Pathology, and Psychiatry (N.W.K.), Boston University School of Medicine; Department of Health Services (D.R.M.), Boston University School of Public Health, Boston, MA; and Center for Quality, Outcomes and Economic Research (S.C.V., D.R.M.) and Geriatric Research Education and Clinical Center (N.W.K.), Bedford Veterans Affairs Medical Center, Bedford, MA.