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Fig 1.

PRISMA flow diagram.

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Table 1.

Characteristics of the study population.

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Table 1 Expand

Table 2.

Characteristics of included studies.

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Table 2 Expand

Table 3.

Biases reported.

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Table 3 Expand

Table 4.

Main statistical method.

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Table 4 Expand

Table 5.

Study description.

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Table 5 Expand

Table 6.

Quality appraisal of included studies.

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Table 6 Expand