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Glasser J, Feng Z, Moylan A, Del Valle S, Castillo-Chavez C.Glasser J, et al. Among authors: feng z.Math Biosci. 2012 Jan;235(1):1-7. doi: 10.1016/j.mbs.2011.10.001. Epub 2011 Oct 20.Math Biosci. 2012.PMID: 22037144Review.