title: The evaluation of needle exchange programs.
authors.forename: D
authors.initials: D
authors.lastname: Vlahov
authors.forename: R S
authors.initials: RS
authors.lastname: Brookmeyer
mesh_terms: D015658:HIV Infections / Q000517:prevention & control / Q000635:transmission; D006801:Humans; D018671:Needle-Exchange Programs; D015397:Program Evaluation