. 2020 Oct 16;10:556243. doi: 10.3389/fonc.2020.556243
Copyright © 2020 Lv, Shi, Fei, Chen, Xie, Wang, Wang and Hu.
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.
Figure 1.
Flowchart of database search and study identification.