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Table 1.

Search Strategy (in PubMed).

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Table 2.

Summary of descriptive characteristics of finally selected studies.

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Fig 1.

Flow diagram of data search according to PRISMA [24].

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Table 3.

New Castle Ottawa (NOS) Quality Assessment [26]*.

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Table 4.

Quality assessment of included cohort studies based on the Newcastle-Ottawa scale.

[25]

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