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Erickson, K.I., Kim, J.S., Suever, B.L., Voss, M.W., Francis, B.M., & Kramer, A.F. (2008). Genetic contributions to age-related decline in executive function: A 10 year longitudinal study of COMT and BDNF polymorphisms. Frontiers in Human Neuroscience, 2,(11), 1-9.