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Table 1.

Systematic search strategy (PICOS strategy).

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Table 2.

Excluded studies.

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Table 2 Expand

Fig 1.

“PRISMA flow diagram of the screening and selection process”.

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Table 3.

Main characteristics of selected studies.

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Table 3 Expand

Table 4.

Assessment of quality and the risk of bias (NOS Scale).

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Table 4 Expand