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Smith RM, Adeney-Steel M, Fulcher G, Longley WA.Smith RM, et al.Arch Phys Med Rehabil. 2006 May;87(5):723-7. doi: 10.1016/j.apmr.2006.01.015.Arch Phys Med Rehabil. 2006.PMID: 16635637Clinical Trial.