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Lipsitch M, Viboud C.Lipsitch M, et al. Among authors: viboud c.Proc Natl Acad Sci U S A. 2009 Mar 10;106(10):3645-6. doi: 10.1073/pnas.0900933106.Proc Natl Acad Sci U S A. 2009.PMID: 19276125Free PMC article.No abstract available.