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. 2021 Jan 20;11:603947. doi: 10.3389/fneur.2020.603947

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Copyright © 2021 Ren, Ai, Li, Xia and Sun.

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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Forest plot of PFS in glioblastoma between lomustine plus bevacizumab and control groups. (A) All of the studies were included. (B) The study of Wick was removed. PFS, progression-free survival; Lom, lomustine; Bev, bevacizumab.