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Kulp CW, Smith S.Kulp CW, et al.Phys Rev E Stat Nonlin Soft Matter Phys. 2011 Feb;83(2 Pt 2):026201. doi: 10.1103/PhysRevE.83.026201. Epub 2011 Feb 10.Phys Rev E Stat Nonlin Soft Matter Phys. 2011.PMID: 21405890