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Pocuca, Nina and Mefodeva, Valeriya and Connor, Jason P and Campbell, Gabrielle and Hides, Leanne (2026) Severity of polysubstance use among young people seeking drug and alcohol treatment, and social and mental health correlates: an observational study. Substance Use & Misuse, Early online, pp. 1-8. https://doi.org/10.1080/10826084.2026.2639050.