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. 2021 Jun 4;40(9):1791–1802. doi: 10.1007/s10096-021-04282-7

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© The Author(s) 2021

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Fig. 4 — Funnel plot of studies included in the meta-analysis. The distribution of the studies (dots) is asymmetric suggesting an evidence of publication bias that is also found by Egger’s regression test (P=0.006) and Begg and Mazumdar rank correlation (P=0.5)