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. 2009 Sep 7;339:b3354. doi: 10.1136/bmj.b3354

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graphic file with name quae644005.f5_default.jpg — Fig 5 Funnel plot of the six included studies (solid circles) and two added studies (open circles) based on a trim and fill algorithm. The pooled odds ratio and 95% confidence interval based on the six included studies (solid diamond) and following the addition of the extra studies (open diamond) are shown