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Retention in the Austrian opioid agonist treatment system: a national prospective cohort study. 

Busch, M., Klein, C., Uhl, A. et al. 

Harm Reduct J 18, 25 (2021). doi.org/10.1186/s12954-021-00473-9

https://harmreductionjournal.biomedcentral.com/articles/10.1186/s12954-021-00473-9