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.
Risk of bias graph of clinical studies: A) Risk of bias of non-randomized clinical studies assessed with the ROBINS-I tool, (B) Risk of bias of randomized clinical studies assessed with the RoB-2 tool. The green color represents a low risk of bias, yellow represents an unclear risk of bias, and red represents a high risk of bias.
