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Szabo, A., Mullen, S.P., White, S.M., Wojcicki, T.M., Mailey, E.L., Gothe, N., Olson, E.A., Fanning, J., Kramer. A.F. & McAuley, E. (2011). Longitudinal invariance and construct validity of the abbreviated late-life function and disability instrument in healthy older adult. Archives of Physical Medicine and Rehabilitation, 92, 785-791.