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Telford MJ, Littlewood DT.Telford MJ, et al.Philos Trans R Soc Lond B Biol Sci. 2008 Apr 27;363(1496):1421-4. doi: 10.1098/rstb.2007.2231.Philos Trans R Soc Lond B Biol Sci. 2008.PMID: 18192193Free PMC article.