title: Methadone maintenance as medical treatment: the continuing need for controlled clinical study.
mesh_terms: D002986:Clinical Trials as Topic; D003415:Crime; D006556:Heroin Dependence / Q000188:drug therapy* / Q000628:therapy; D006801:Humans; D008691:Methadone / Q000627:therapeutic use*; D012106:Research
chemical_list: D008691:Methadone