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Popp AW, Meer S, Krieg MA, Perrelet R, Hans D, Lippuner K.Popp AW, et al.Eur Spine J. 2016 Nov;25(11):3432-3438. doi: 10.1007/s00586-015-4035-6. Epub 2015 May 27.Eur Spine J. 2016.PMID: 26014806Free article.