Developing an epidemiologic field team for drug dependence.
D001741:Black or African American; D002641:Chicago; D003140:Communicable Disease Control; D003153:Community Health Services; D004812:Epidemiologic Methods; D003932:Heroin; D006801:Humans; D008691:Methadone; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000517:prevention & control*
D003932:Heroin; D008691:Methadone