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Champion HC, Bivalacqua TJ, Greenberg SS, Giles TD, Hyman AL, Kadowitz PJ.Champion HC, et al. Among authors: greenberg ss.Proc Natl Acad Sci U S A. 2002 Oct 1;99(20):13248-53. doi: 10.1073/pnas.182225899. Epub 2002 Sep 17.Proc Natl Acad Sci U S A. 2002.PMID: 12237402Free PMC article.