title: Methadone maintenance: expanding the concept of service.
mesh_terms: D003417:Criminal Psychology; D003932:Heroin; D006801:Humans; D008691:Methadone / Q000627:therapeutic use*; D009021:Morphine Dependence / Q000628:therapy*; D012050:Rehabilitation, Vocational; D019966:Substance-Related Disorders / Q000534:rehabilitation; D014481:United States
chemical_list: D003932:Heroin; D008691:Methadone