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Bi X, Patil CA, Lynch CC, Pharr GM, Mahadevan-Jansen A, Nyman JS.Bi X, et al.J Biomech. 2011 Jan 11;44(2):297-303. doi: 10.1016/j.jbiomech.2010.10.009. Epub 2010 Oct 28.J Biomech. 2011.PMID: 21035119Free PMC article.