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Fig 1.

PRISMA flow diagram.

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Table 1.

Features of included randomized controlled trials.

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Table 2.

Interventions and outcomes.

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Table 2 Expand

Table 3.

Estimated potential risk of Bias.

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Table 3 Expand

Fig 2.

Efficacy of brief interventions vs. assessment only control conditions.

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Fig 2 Expand

Fig 3.

Funnel plot for the meta-analysis of brief interventions vs. assessment only control conditions.

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Fig 3 Expand