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Showing articles 0 to 1 of 1 Filter Applied: dementia,unknown etiology (Click to remove) The Relative Frequency of "Dementia of Unknown Etiology" Increases With Age and Is nearly 50% in Nonagenarians Arch Neurol 57:713-719, Crystal,H.A.,et al, 2000 Showing articles 0 to 1 of 1