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Eitzen I, Hakestad KA, Risberg MA.Eitzen I, et al.Arch Phys Med Rehabil. 2012 Mar;93(3):420-7. doi: 10.1016/j.apmr.2011.10.001. Epub 2012 Jan 23.Arch Phys Med Rehabil. 2012.PMID: 22265342