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. 2017 Mar 22;7:234. doi: 10.1038/s41598-017-00299-1

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© The Author(s) 2017

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Funnel plot for evaluating publication bias on the association between the PTB risk and MIF-173G/C gene polymorphism (A) as well as on the association between the serum MIF levels and PTB (B). Each circle represents a separate study for the indicated association.