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.
Literature quality assessment. The green circle means the information is clearly described in the study. The yellow circle means the information is partially met in the study. The red circle means the information is not described in the study.
