title: Reduction of the frequency of drug use of veterans Enrolled in an outpatient methadone maintenance treatment program.
mesh_terms: D000328:Adult; D000553:Ambulatory Care; D006801:Humans; D008297:Male; D008691:Methadone / Q000627:therapeutic use*; D009294:Narcotics / Q000652:urine; D009293:Opioid-Related Disorders / Q000534:rehabilitation*; D010043:Outcome and Process Assessment, Health Care; D014728:Veterans / Q000523:psychology*
chemical_list: D009294:Narcotics; D008691:Methadone