title: Altered dose incentive procedures: effects on polydrug use among methadone maintenance patients.
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008691:Methadone / Q000008:administration & dosage*; D009042:Motivation; D011897:Random Allocation; D019966:Substance-Related Disorders / Q000534:rehabilitation*
chemical_list: D008691:Methadone