Trends in Primary and Secondary Syphilis and HIV Infections in Men Who Have Sex with Men — San Francisco and Los Angeles, California, 1998–2002 von Dilley, J.W, Klausner, J.D, McFarland, W, Kellogg, T.A, Kohn, R, Wong, W, Louie, B.T, Taylor, M.M, Kerndt, P.R, Carlos, J, Chavers, C.R, Bolan, G, Holmberg, S.D, Greenberg, A.E, Byers, R.H, King, J.B

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