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. 2016 Mar 11;9:1371–1379. doi: 10.2147/OTT.S97969

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© 2016 Wang et al. This work is published and licensed by Dove Medical Press Limited

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Begg’s funnel plots of the publication bias for overall merged analysis of OS.

Note: Each point represents a separate study.

Abbreviations: HR, hazard ratio; OS, overall survival; SE, standard error.