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Schwendeman SP, Costantino HR, Gupta RK, Siber GR, Klibanov AM, Langer R.Schwendeman SP, et al. Among authors: costantino hr.Proc Natl Acad Sci U S A. 1995 Nov 21;92(24):11234-8. doi: 10.1073/pnas.92.24.11234.Proc Natl Acad Sci U S A. 1995.PMID: 7479971Free PMC article.