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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

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Harm Reduction Journal

ISSN: 1477-7517