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Schmid, Stefan; Hilfiker, Roger; Radlinger, Lorenz (2011). Reliability and validity of trunk accelerometry-derived performance measurements in a standardized heel-rise test in elderly subjects The Journal of Rehabilitation Research & Development, 48(9), pp. 1137-1144. Department of Veterans Affairs, Rehabilitation Research and Development Service 10.1682/JRRD.2011.01.0003