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Stiefel KM, Englitz B, Sejnowski TJ.Stiefel KM, et al.Proc Natl Acad Sci U S A. 2013 May 7;110(19):7886-91. doi: 10.1073/pnas.1305219110. Epub 2013 Apr 22.Proc Natl Acad Sci U S A. 2013.PMID: 23610409Free PMC article.