title: Estimating prevalence of injecting drug use in an urban population: limitations of the three-sample estimation procedure.
authors.forename: J R
authors.initials: JR
authors.lastname: Armstrong
authors.forename: R J
authors.initials: RJ
authors.lastname: Hayes
mesh_terms: D006801:Humans; D015233:Models, Statistical; D015995:Prevalence; D012606:Scotland / Q000453:epidemiology; D019966:Substance-Related Disorders / Q000453:epidemiology*; D014505:Urban Population