title: Cocaine abuse during narcotic substitution therapy: three years later.
mesh_terms: D000293:Adolescent; D000328:Adult; D001741:Black or African American; D000367:Age Factors; D003042:Cocaine / Q000652:urine; D003153:Community Health Services; D005260:Female; D006556:Heroin Dependence / Q000188:drug therapy*; D006801:Humans; D008297:Male; D008691:Methadone / Q000627:therapeutic use; D010414:Pennsylvania; D012737:Sex Factors; D019966:Substance-Related Disorders / Q000453:epidemiology
chemical_list: D003042:Cocaine; D008691:Methadone