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Friedman EM, Hayney MS, Love GD, Urry HL, Rosenkranz MA, Davidson RJ, Singer BH, Ryff CD.Friedman EM, et al.Proc Natl Acad Sci U S A. 2005 Dec 20;102(51):18757-62. doi: 10.1073/pnas.0509281102. Epub 2005 Dec 8.Proc Natl Acad Sci U S A. 2005.PMID: 16339311Free PMC article.