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. 2013 Sep 20;8(9):e74028. doi: 10.1371/journal.pone.0074028

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© 2013 Pan 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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Forest plot for meta-analysis of retrospective studies: rate of negative margins of non-palpable breast cancers in IOUS group compared with that in GWL group. The width of the horizontal line represents the 95% CI of the individual study, and the square proportional represents the weight of each study. The diamond represents the pooled OR and 95% CI.