title: Study identifies traits of effective needle exchange programs.
mesh_terms: D002487:Centers for Disease Control and Prevention, U.S.; D015658:HIV Infections / Q000150:complications / Q000517:prevention & control* / Q000635:transmission; D006801:Humans; D018671:Needle-Exchange Programs / Q000592:standards*; D015397:Program Evaluation; D015819:Substance Abuse, Intravenous / Q000150:complications; D014481:United States