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Colcombe, S.J., Erickson, K.I., Scalf, P.E., Kim, J.S., Prakash, R., McAuley, E., Elavsky, S., Marquez, D.X., Hu, L. & Kramer, A.F. (2006). Aerobic exercise training increases brain volume in aging humans. Journal of Gerontology: Medical Sciences, 61, 1166-1170.