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Chan SC, Gantenbein-Ritter B, Leung VY, Chan D, Cheung KM, Ito K.Chan SC, et al.Spine J. 2010 Jun;10(6):486-96. doi: 10.1016/j.spinee.2009.12.019. Epub 2010 Feb 19.Spine J. 2010.PMID: 20171933