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Chen X, Nordhaus WD.Chen X, et al. Among authors: nordhaus wd.Proc Natl Acad Sci U S A. 2011 May 24;108(21):8589-94. doi: 10.1073/pnas.1017031108. Epub 2011 May 16.Proc Natl Acad Sci U S A. 2011.PMID: 21576474Free PMC article.
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