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Niklason LE, Yeh AT, Calle EA, Bai Y, Valentín A, Humphrey JD.Niklason LE, et al. Among authors: humphrey jd.Proc Natl Acad Sci U S A. 2010 Feb 23;107(8):3335-9. doi: 10.1073/pnas.0907813106. Epub 2009 Dec 1.Proc Natl Acad Sci U S A. 2010.PMID: 19955446Free PMC article.