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Uchtenhagen, A., Gutzwiller, F., Dobler-Mikola, A., Steffen, T., & Rihs-Middel, M. (1999). Prescription of narcotics for heroin addicts : main results of the Swiss national cohort study (A. Uchtenhagen, A. Dobler-Mikola, T. Steffen, F. Gutzwiller, R. Blättler, & S. Pfeifer, Eds.). Basel: Karger.
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