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Jensen OK, Nielsen CV, Sørensen JS, Stengaard-Pedersen K.Jensen OK, et al.Spine J. 2014 Nov 1;14(11):2568-81. doi: 10.1016/j.spinee.2014.02.018. Epub 2014 Feb 14.Spine J. 2014.PMID: 24534386Clinical Trial.