Abuse of prescription opioids has reached epidemic proportions, especially
among enrollees in opioid treatment programs (OTPs) in certain regions of the United
States. Our previous work indicated that chronic pain contributes to opioid abuse,
especially among OTP patients. However little is known about current and lifetime
prevalence of different types of opioids among methadone enrollees or factors that may
contribute to the use of different types of opioid drugs.
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