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Zimmerman, B., Sutton, B.P., Low, K.A., Tan, C.H., Schneider-Garces, N., Fletcher, M.A., Li, Y., Ouyang, C., Maclin, E.L., Gratton, G., & Fabiani, M. (2014). Cardiorespiratory fitness mediates the effects of aging on cerebral blood flow. Frontiers in Aging Neuroscience, 8, 59. http://10.3389/fnagi.2014.00059