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Zweig T, Aghayev E, Melloh M, Dietrich D, Röder C; SWISSspine Registry Group.Zweig T, et al.Eur Spine J. 2012 Aug;21 Suppl 6(Suppl 6):S729-36. doi: 10.1007/s00586-011-1863-x. Epub 2011 Jun 10.Eur Spine J. 2012.PMID: 21660458Free PMC article.