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\bibitem{Hibell_etal2009} Hibell, B., Guttormsson, U., Ahlstr{\"o}m, S., Balakireva, O., Bjarnason, T., Kokkevi, A., et al. (2009). \textit{The 2007 ESPAD report : substance use among students in 35 European countries}  (European School Survey Project on alcohol and Other Drugs, Ed.). Stockholm: The Swedish Council for Information on alcohol and other Drugs (CAN); The European Monitoring Centre for Drugs and Drug Addiction (EMCDDA); Council of Europe, Co-operation Group to Combat Drug Abuse and Illicit Trafficking in Drugs (Pompidou Group).

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