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Tashkin DP, Simmons MS, Coulson AH, Clark VA, Gong H Jr.Tashkin DP, et al.Chest. 1987 Oct;92(4):638-44. doi: 10.1378/chest.92.4.638.Chest. 1987.PMID: 3652749
Gil E, Chen B, Kleerup E, Webber M, Tashkin DP.Gil E, et al. Among authors: tashkin dp.Life Sci. 1995;56(23-24):2193-9. doi: 10.1016/0024-3205(95)00207-m.Life Sci. 1995.PMID: 7776849