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Swartz MA, Tschumperlin DJ, Kamm RD, Drazen JM.Swartz MA, et al. Among authors: kamm rd.Proc Natl Acad Sci U S A. 2001 May 22;98(11):6180-5. doi: 10.1073/pnas.111133298. Epub 2001 May 15.Proc Natl Acad Sci U S A. 2001.PMID: 11353845Free PMC article.