title: Time series design to evaluate effectiveness of methadone maintenance intervention.
mesh_terms: D002188:Cannabis; D004651:Employment; D005069:Evaluation Studies as Topic / Q000379:methods; D006556:Heroin Dependence / Q000534:rehabilitation*; D006801:Humans; D008297:Male; D008691:Methadone / Q000627:therapeutic use*; D012107:Research Design; D013997:Time Factors
chemical_list: D008691:Methadone