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\bibitem{Hillebrand_etal2008} Hillebrand, J., Olszewski, D., \& Sedefov, R. (2008). \textit{GHB and its precursor GBL : an emerging trend case study}  (European Monitoring Centre for Drugs and Drug Addiction, Ed.). Lisbon: European Monitoring Centre for Drugs and Drug Addiction (EMCDDA).

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