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Pumberger M, Hughes AP, Huang RR, Sama AA, Cammisa FP, Girardi FP.Pumberger M, et al. Among authors: hughes ap.Eur Spine J. 2012 Jun;21(6):1192-9. doi: 10.1007/s00586-011-2087-9. Epub 2011 Dec 1.Eur Spine J. 2012.PMID: 22130617Free PMC article.