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Ristolainen L, Kettunen JA, Heliövaara M, Kujala UM, Heinonen A, Schlenzka D.Ristolainen L, et al. Among authors: kujala um.Eur Spine J. 2012 May;21(5):819-24. doi: 10.1007/s00586-011-2075-0. Epub 2011 Nov 22.Eur Spine J. 2012.PMID: 22101868Free PMC article.