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Delhey PR, Holzapfel BM, Kanz KG, Mayer-Wagner S.Delhey PR, et al.Spine J. 2015 Jun 1;15(6):e53-6. doi: 10.1016/j.spinee.2013.08.021. Epub 2013 Nov 9.Spine J. 2015.PMID: 24215900