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. 2014 Mar 5;9(3):e90090. doi: 10.1371/journal.pone.0090090

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© 2014 Xu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Each circle represents as an independent study for the indicated association. Log[OR], natural logarithm of OR. Horizontal lines mean effect size. A: Begg's funnel plot of publication bias test for Fas -670A>G polymorphism. B: Begg's funnel plot of publication bias test for Fas -1377G>A polymorphism. C: Begg's funnel plot of publication bias test for FasL -844C>T polymorphism.