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Hicks GE, Morone N, Weiner DK.Hicks GE, et al.Spine (Phila Pa 1976). 2009 May 20;34(12):1301-6. doi: 10.1097/BRS.0b013e3181a18263.Spine (Phila Pa 1976). 2009.PMID: 19455005Free PMC article.