Source: Meyers-Pantele, S.A., Mittal, M.L., Jain, S. et al. The influence of poly-drug use patterns on the association between opioid agonist treatment engagement and injecting initiation assistance. Subst Abuse Treat Prev Policy 17, 39 (2022). https://doi.org/10.1186/s13011-022-00470-6 Abstract...