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Porto MA, Silva P, Rosa R, Volpon JB, Shimano AC, de Paula FJ, Defino HL.Porto MA, et al. Among authors: shimano ac.Eur Spine J. 2012 May;21(5):956-63. doi: 10.1007/s00586-011-2120-z. Epub 2011 Dec 16.Eur Spine J. 2012.PMID: 22173611Free PMC article.