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Kroeze RJ, van der Veen AJ, van Royen BJ, Bank RA, Helder MN, Smit TH.Kroeze RJ, et al.Eur Spine J. 2013 Dec;22(12):2731-9. doi: 10.1007/s00586-013-3003-2. Epub 2013 Sep 17.Eur Spine J. 2013.PMID: 24043338Free PMC article.