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Beckett, L.A., Brock, D.B., Lemke, J.H., et al. (1996) Analysis of Change in Self-Reported Physical Function among Older Persons in Four Population Studies. American Journal of Epidemiology, 143, 766-778.
http://www.ncbi.nlm.nih.gov/pubmed/8610686
http://dx.doi.org/10.1093/oxfordjournals.aje.a008814

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