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\bibitem{Burkhart_etal2009} Burkhart, G., Fegert, J. M., Schepker, R., Keller, F., Ludolph, A. G., Plener, P. L., et al. (2009). \textit{Preventing later substance use disorders in at-risk children and adolescents : a review of the theory and evidence base of indicated prevention}  (European Monitoring Centre for Drugs and Drug Addiction, Ed.). Lisbon; Luxembourg: Office for Official Publications of the European Communities.

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