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Shields RK, Dudley-Javoroski S, Law LA.Shields RK, et al.Spine (Phila Pa 1976). 2006 Mar 1;31(5):548-53. doi: 10.1097/01.brs.0000201303.49308.a8.Spine (Phila Pa 1976). 2006.PMID: 16508550Free PMC article.