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\bibitem{Vandrey_etal2008} Vandrey, R. G., Budney, A. J., Hughes, J. R., \& Liguori, A. (2008). A within-subject comparison of withdrawal symptoms during abstinence from cannabis, tobacco, and both substances. \textit{Drug and alcohol dependence : an international journal on biomedical and psychosocial approaches}, \textit{34}(92; 21.07.2008), 48--54.

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