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Zwerver J, Verhagen E, Hartgens F, van den Akker-Scheek I, Diercks RL.Zwerver J, et al.BMC Musculoskelet Disord. 2010 Feb 8;11:28. doi: 10.1186/1471-2474-11-28.BMC Musculoskelet Disord. 2010.PMID: 20144188Free PMC article.Clinical Trial.