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Heroin Dependence
Opioid-Related Disorders
Substance Withdrawal Syndrome
Cocaine-Related Disorders
Buprenorphine
Narcotics
Narcotic Antagonists
Hydromorphone
Analgesics, Opioid
Methadone
mu Opioid Receptors
Fentanyl
Naloxone
Double-Blind Method
Substance Abuse Detection
Cross-Over Studies
Drug Dose Response Relationship
Analysis of Variance
Choice Behavior
Questionnaires
Co-Publications
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