Chen, S. Y., Gibson, S., Katz, M. H., Klausner, J. D., Dilley, J. W., Schwarcz, S. K., . . . McFarland, W. (2002). 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.

Chen, Sanny Y., Steven Gibson, Mitchell H. Katz, Jeffrey D. Klausner, James W. Dilley, Sandra K. Schwarcz, Timothy A. Kellogg, και 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.