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\bibitem{Sedefov_etal2009} Sedefov, R., Gallegos, A., King, L., Lopez, D., Auw{\"a}rter, V., Hughes, B., et al. (2009). \textit{Understanding the {\textquotedblleft}Spice{\textquotedblright} phenomenon}  (European Monitoring Centre for Drugs and Drug Addiction, Ed.). Luxembourg: Office for Official Publications of the European Communities.

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