title: Availability of activity reinforcers in a drug abuse clinic: a preliminary report.
mesh_terms: D000293:Adolescent; D000328:Adult; D001521:Behavior Therapy; D005260:Female; D006556:Heroin Dependence / Q000628:therapy; D006801:Humans; D008297:Male; D008691:Methadone / Q000627:therapeutic use; D010044:Outpatient Clinics, Hospital; D011613:Psychotherapy; D012054:Reinforcement, Psychology; D019966:Substance-Related Disorders / Q000628:therapy*
chemical_list: D008691:Methadone