Breadcrumb Home Insights Publications article Substance use and sexual risk: a participant- and episode-level analysis among a cohort of men who have sex with men Colfax G, Vittinghoff E, Husnik MJ, McKirnan D, Buchbinder S, Koblin B, Celum C, Chesney M, Huang Y, Mayer K, Bozeman S, Judson FN, Bryant KJ, Coates TJ; EXPLORE Study Team. Article May 1, 2004 American Journal of Epidemiology — 159(10):1002-12