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Fig 1.

PRISMA flow chart for the literature search.

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Table 1.

Characteristics detailed of each included systematic review.

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Table 2.

Methodological characteristics of systematic reviews.

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Fig 2.

World map with highlighted countries where the 17 included reviews were from (n = 17).

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Fig 3.

The overall degree of overlapping.

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Fig 4.

Overall confidence in the results of the reviews (Table).

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Fig 5.

Overall confidence in the results of the reviews (Bar plot).

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