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Fig 1.

Flowchart of the literature research by database.

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Table 1.

Search strategy: Key words used for the literature research.

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Table 2.

Characteristics of the included reviews (n = 20).

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Table 2 Expand

Table 3.

Summary of the results of the included reviews: The importance of a determinant and its strength of evidence.

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Table 3 Expand

Table 4.

Quality Assessment of the included reviews using the AMSTAR checklist.

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