title: Needle and syringe exchange programs in Amsterdam.
authors.forename: Ewald
authors.initials: E
authors.lastname: Witteveen
authors.forename: Gerard
authors.initials: G
authors.lastname: Schippers
mesh_terms: D002391:Catchment Area, Health; D015658:HIV Infections / Q000453:epidemiology / Q000517:prevention & control; D006293:Health Promotion; D006801:Humans; D018671:Needle-Exchange Programs / Q000458:organization & administration* / Q000706:statistics & numerical data; D009426:Netherlands / Q000453:epidemiology; D015819:Substance Abuse, Intravenous / Q000453:epidemiology / Q000517:prevention & control