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\bibitem{Bauer_etal1993} Bauer, G., Cassis, I., Gutzwiller, F., Somaini, B., Stutz Steiger, T., Twisselmann, W., et al. (1993). \textit{HIV-prevention in Switzerland : targets, strategies, interventions : short version}. Berne: Swiss Federal Office of Public Health (FOPH).

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