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Kamper SJ, Stanton TR, Williams CM, Maher CG, Hush JM.Kamper SJ, et al.Eur Spine J. 2011 Jan;20(1):9-18. doi: 10.1007/s00586-010-1477-8. Epub 2010 Jun 16.Eur Spine J. 2011.PMID: 20552378Free PMC article.Review.