Atkinson HH, Rapp SR, Williamson JD, Lovato J, Absher JR, Gass M, Henderson VW, Johnson KC, Kostis JB, Sink KM, Mouton CP, Ockene JK, Stefanick ML, Lane DS, Espeland MA. The relationship between cognitive function and physical performance in older women: results from the women's health initiative memory study. J Gerontol A Biol Sci Med Sci. 2010 Mar; 65(3):300-6.