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Table 1.

Risk of bias tool.

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Table 1 Expand

Fig 1.

PRISMA flow diagram.

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Table 2.

Characteristics of the included meta–research studies (N = 21).

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Table 2 Expand

Table 3.

Risk of bias of the included meta–research studies N = 21.

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Table 3 Expand

Fig 2.

Forest plot.

Forest plot prevalence and 95% confidence intervals for the percentage of studies using an SR to justify the study.

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Fig 2 Expand