Continuing high prevalence of HIV and risk behaviors among young men who have sex with men: the young men's survey in the San Francisco Bay Area in 1992 to 1993 and in 1994 to 1995.
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W. Mcfarland | M. Katz | G. Lemp | W. Mcfarland | M. Katz | D. MacKellar | T. Kellogg | M. Fenstersheib | L. Valleroy | V. Guillin | M. Shaw | W. McFarland | Michael Shaw