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Bivalacqua TJ, Champion HC, Usta MF, Cellek S, Chitaley K, Webb RC, Lewis RL, Mills TM, Hellstrom WJ, Kadowitz PJ.Bivalacqua TJ, et al.Proc Natl Acad Sci U S A. 2004 Jun 15;101(24):9121-6. doi: 10.1073/pnas.0400520101. Epub 2004 Jun 7.Proc Natl Acad Sci U S A. 2004.PMID: 15184671Free PMC article.