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. 2018 Oct 31;8:486. doi: 10.3389/fonc.2018.00486

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Copyright © 2018 Wang, Peng, Wang and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Meta-analysis of serum VEGF level for overall survival and progression-free survival in nasopharyngeal cancer. Weights are from random effects analysis. CI, confidence interval; HR, hazard ratio; W (random), Weights (random effects model).