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\bibitem{Bauer_etal1993} Bauer, G., Cassis, I., Gutzwiller, F., Somaini, B., Stutz Steiger, T., Twisselmann, W., et al. (1993). \textit{Pr{\'e}vention du VIH en Suisse : buts, strat{\'e}gies, mesures}. Berne: Office f{\'e}d{\'e}ral de la sant{\'e} publique (OFSP), Division promotion de la sant{\'e}, Section sida.

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