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Dahm, Georges and Roschel, Karin and Marson, Claude and Bourmaud, Adèle and Macedo, Jennifer and Lupo, Mauro and Fauchet, Lionel and Allar, Claudia and Schaaf, Raoul and Schneider, Serge (2023) Consumer expectations, drug effects, price and purity of heroin and cocaine purchased at drug consumption rooms. Harm Reduction Journal , 20 .