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Correction

        In the article “Acceleration Metrics Are Responsive to Change in Upper Extremity Function of Stroke Survivors” (Urbin et al, Arch Phys Med Rehabil 2015;96:854-61), the incorrect equation is listed for magnitude ratio in Appendix 1. The correct equation is shown below.
        =x˜(epochvalue1paretic/epochvalue1non-pareticepochvalueiparetic/epochvalueinon-paretic)


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