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Table 1.

Inclusion Criteria (PICOS [16], [47]).

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Table 1 Expand

Table 2.

Studies included in the meta-analysis.

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Table 2 Expand

Figure 1.

Study Flow Chart.

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Figure 1 Expand

Table 3.

Sample characteristics.

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Table 3 Expand

Figure 2.

Distribution of quality criteria (k = 96 samples).

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Figure 2 Expand

Table 4.

Pre-post-effect sizes (SCL & IIP), heterogeneity and publication bias (Egger’s test).

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Table 4 Expand

Table 5.

Pre-post-follow-up-effect sizes (SCL & IIP).

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Table 5 Expand

Figure 3.

Funnel plot SCL GSI (k = 80 samples).

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Figure 3 Expand