Changes in the frequency of use and abuse of drugs by Los Angeles County methadone maintenance patients: an observation based on urine drug testings in 1975 and 1979.
D000662:Amphetamines / Q000652:urine; D001463:Barbiturates / Q000652:urine; D002140:California; D006801:Humans; D008691:Methadone / Q000627:therapeutic use* / Q000652:urine; D009294:Narcotics / Q000652:urine; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000534:rehabilitation / Q000652:urine
D000662:Amphetamines; D001463:Barbiturates; D009294:Narcotics; D008691:Methadone