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BACKGROUND We investigated the prevalence and protective value of serosorting [ie, establishing HIV concordance in advance to practice unprotected anal intercourse (UAI)] with casual partners (CP)(More)
OBJECTIVE To gain insight in the ongoing HIV transmission, we compared sexual risk behaviour pre-HIV and post-HIV seroconversion in 206 MSM participating in the Amsterdam Cohort Studies (1984-2008)(More)
OBJECTIVE To investigate site-specific condom-use norms as assumed by visitors of gay venues and websites across The Netherlands and their association with men's own use of condoms. METHODS In(More)