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Chen, Sanny Y., Steven Gibson, Mitchell H. Katz, Jeffrey D. Klausner, James W. Dilley, Sandra K. Schwarcz, Timothy A. Kellogg, a Willi McFarland. CONTINUING INCREASES IN SEXUAL RISK BEHAVIOR AND SEXUALLY TRANSMITTED DISEASES AMONG MEN WHO HAVE SEX WITH MEN: SAN FRANCISCO, CALIF, 1999–2001. © American Journal of Public Health 2002, 2002.

Chen, Sanny Y., et al. CONTINUING INCREASES IN SEXUAL RISK BEHAVIOR AND SEXUALLY TRANSMITTED DISEASES AMONG MEN WHO HAVE SEX WITH MEN: SAN FRANCISCO, CALIF, 1999–2001. © American Journal of Public Health 2002, 2002.