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\bibitem{Bretscher-Dutoit_etal1996} Bretscher-Dutoit, C., Ruckstuhl, A., Staub, R., \& Thorens, J. - J. (1996). \textit{Programme d{\textquoteright}action jeunesse et sida 1996-1998}. Berne: Office f{\'e}d{\'e}ral de la sant{\'e} publique (OFSP).

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