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Stefánsdóttir A, Johansson A, Lidgren L, Wagner P, W-Dahl A.Stefánsdóttir A, et al. Among authors: wagner p.Acta Orthop. 2013 Feb;84(1):87-91. doi: 10.3109/17453674.2013.773120.Acta Orthop. 2013.PMID: 23409844Free PMC article.