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Gutzwiller, F and Steffen, T, eds. (1999) Cost-benefit analysis of heroin maintenance treatment. Medical prescription of narcotics; v. 2 Basel: Karger .
Uchtenhagen, A and Dobler-Mikola, A and Steffen, T and Gutzwiller, F and Blattler, R and Pfeifer, S (1999) Prescription of narcotics for heroin addicts: main results of the Swiss national cohort study. Medical prescription of narcotics; v. 1 Basel: Karger .