Figure 4.
Risk of bias evaluation with RoBANS 2 tool for nonrandomized trial. Green: low risk of bias; yellow: unclear risk of bias; red: high risk of bias; gray: not applicable.
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.