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\bibitem{Hibell_etal2012} Hibell, B., Guttormsson, U., Ahlstr{\"o}m, S., Balakireva, O., Bjarnason, T., Kokkevi, A., et al. (2012). \textit{Summary : the 2011 ESPAD report : substance use among students in 35 countries}  (European Monitoring Centre for Drugs and Drug Addiction, Ed.). Luxembourg: Publications Office of the European Union.

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