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Lefer AM, Ma XL, Weyrich AS, Scalia R.Lefer AM, et al. Among authors: scalia r.Proc Natl Acad Sci U S A. 1993 Feb 1;90(3):1018-22. doi: 10.1073/pnas.90.3.1018.Proc Natl Acad Sci U S A. 1993.PMID: 8381531Free PMC article.