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. 2016 May 3;353:i2231. doi: 10.1136/bmj.i2231

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

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graphic file with name salf026084.f5_default.jpg — Fig 5 Funnel plot for publication bias. Scatter plot reporting risk ratio of the studies testing dipeptidyl peptidase-4 (DPP-4) inhibitors plus sulphonylureas compared with placebo plus sulphonylureas (horizontal axis) against their standard error (vertical axis)