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Non-prescribed use of methadone and buprenorphine prior to opioid substitution treatment: lifetime prevalence, motives, and drug sources among people with opioid dependence in five Swedish cities

Björn Johnson and Torkel Richert

Harm Reduction Journal 2019, 16:31, doi.org/10.1186/s12954-019-0301-y

https://harmreductionjournal.biomedcentral.com/articles/10.1186/s12954-019-0301-y