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Citation: H. Hagan et al., Volunteer bias in nonrandomized evaluations of the efficacy of needle-exchange programs, J URBAN H, 77(1), 2000, pp. 103-112

Authors: Hagan, H McGough, JP Thiede, H Hopkins, S Duchin, J Alexander, ER

Citation: H. Hagan et al., Reduced injection frequency and increased entry and retention in drug treatment associated with needle-exchange participation in Seattle drug injectors, J SUBST ABU, 19(3), 2000, pp. 247-252

Authors: Hagan, H McGough, JP Thiede, H Hopkins, SG Alexander, ER

Citation: H. Hagan et al., Re: "Syringe exchange and risk of infection with hepatitis B and C viruses" - Five of the authors reply, AM J EPIDEM, 151(2), 2000, pp. 207-208

Authors: Hagan, H McGough, JP Thiede, H Weiss, NS Hopkins, S Alexander, ER

Citation: H. Hagan et al., Syringe exchange and risk of infection with hepatitis B and C viruses, AM J EPIDEM, 149(3), 1999, pp. 203-213

Authors: Hagan, H Weiss, NS Thiede, H Hopkins, S McGough, JP Alexander, ER

Citation: H. Hagan et al., Reply to "Invited commentary: Needle exchange - No help for hepatitis?" byMoss and Hahn, AM J EPIDEM, 149(3), 1999, pp. 217-218