About 40 million people worldwide have HIV infection (UNAIDS 2004 report [[www.unaids.org/bangkok2004/report.html][1]]). In 2003 alone, almost 5 million new infections occurred, more than 90% of which were sexually acquired. Nearly 50% of the worlds' HIV-infected people are women, and over 30% of
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Jan Balzarini (2005) studied this question.
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