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Opioid and Polydrug Use Among Patients in Opioid Maintenance Treatment.

Carlsen SL, Lunde LH, Torsheim T.

Subst Abuse Rehabil. 2020 Jan 29;11:9-18. doi: 10.2147/SAR.S221618. 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6996215/