Estimation of the number of narcotic addicts in an urban area.
D004219:District of Columbia; D003932:Heroin; D006556:Heroin Dependence; D006801:Humans; D008722:Methods; D013223:Statistics as Topic; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000401:mortality; D014505:Urban Population
D003932:Heroin