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Assessment of Substance Abuse and Associated Factors Among Students of Debre Markos Poly Technique College In Debre Markos Town, East Gojjam Zone, Amhara Regional State, Ethiopia ,2013. GJMR [Internet]. 2013 Jan. 15 [cited 2026 Feb. 5];13(B4):5-15. Available from: https://medicalresearchjournal.org/index.php/GJMR/article/view/377