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Table 1.

Search string.

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Fig 1.

PRISMA flowchart showing the study selection process.

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Fig 2.

Risk of bias graph.

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Fig 2 Expand

Fig 3.

Risk of bias summary.

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Fig 3 Expand

Table 2.

Study descriptor table.

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Table 2 Expand

Fig 4.

Forest plot for pain scores on VAS (0–10).

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Fig 4 Expand

Fig 5.

The risk of adverse events.

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Fig 5 Expand