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Table 1.

Study inclusion and exclusion criteria.

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Table 2.

Medline search strategy.

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Fig 1.

Study selection flow chart.

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Table 3.

Summary of evidence in studies with no serious limitations.

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Table 3 Expand

Table 4.

Summary of evidence in studies with serious limitations.

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Table 4 Expand

Table 5.

Effectiveness of intervention according to the type of intervention and study limitations.

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Table 5 Expand