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Vasudeva VS, Abd-El-Barr M, Pompeu YA, Karhade A, Groff MW, Lu Y.Vasudeva VS, et al.Global Spine J. 2017 Oct;7(7):648-656. doi: 10.1177/2192568217700100. Epub 2017 May 31.Global Spine J. 2017.PMID: 28989844Free PMC article.