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Garrido MI, Kilner JM, Kiebel SJ, Friston KJ.Garrido MI, et al.Proc Natl Acad Sci U S A. 2007 Dec 26;104(52):20961-6. doi: 10.1073/pnas.0706274105. Epub 2007 Dec 17.Proc Natl Acad Sci U S A. 2007.PMID: 18087046Free PMC article.