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Harkema SJ, Hillyer J, Schmidt-Read M, Ardolino E, Sisto SA, Behrman AL.Harkema SJ, et al.Arch Phys Med Rehabil. 2012 Sep;93(9):1588-97. doi: 10.1016/j.apmr.2012.04.032.Arch Phys Med Rehabil. 2012.PMID: 22920456Review.