Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2021 Oct 15;9:705791. doi: 10.3389/fcell.2021.705791

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2021 Liu, Liao, Hosseinifard, Imani and Wen.

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.

PMC Copyright notice

Risk of bias graph. The overall risk of bias was regarded as low in all qualified studies as per the QUADAS-2 assessment. The reviewers' decisions about each risk of bias and applicability concerns graph (A) presented as percentages across of single selected studies (B). “+” low risk of bias; “–” high risk of bias; “?” unclear risk of bias.