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\bibitem{Wang2000} Wang, J. (2000). \textit{The epidemiology of sexual and drug-related behaviors associated with HIV transmission in the 1990s : will HAART matter?} Z{\"u}rich; Bern: Universit{\"a}t Z{\"u}rich, Institut f{\"u}r Sozial- und Pr{\"a}ventivmedizin; Eidgen{\"o}ssische Kommission f{\"u}r Aidsfragen (EKAF).

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