title: AIDS and drug addiction needle exchange schemes: a step in the dark.
authors.forename: B T
authors.initials: BT
authors.lastname: Farid
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000635:transmission*; D006291:Health Policy; D006801:Humans; D009339:Needles; D019966:Substance-Related Disorders; D013594:Syringes; D006113:United Kingdom