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Table 2 Grading for the peer-reviewed literature

From: Harm reduction and viral hepatitis C in European prisons: a cross-sectional survey of 25 countries

Grade A Multicenter trial
Data collection after 2015
Grade B Monocenter trial
Data collection after 2015
Grade C Multicenter trial
Data collection before 2015
Grade D Monocenter trial
Data collection before 2015