Syringe-exchange schemes: part of the necessary package: a reply to Spencer Madden.
Stimson
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GV
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control*; D006556:Heroin Dependence / Q000534:rehabilitation*; D006801:Humans; D007275:Injections, Intravenous; D012309:Risk-Taking; D013594:Syringes; D006113:United Kingdom