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\bibitem{Thanki_etal2012} Thanki, D., Matias, J., Griffiths, P., Noor, A., Olszewski, D., Simon, R., et al. (2012). \textit{Prevalence of daily cannabis use in the European Union and Norway}  (European Monitoring Centre for Drugs and Drug Addiction, Ed.). Luxembourg: Publications Office of the European Union.

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