Figure 2.
Assessment of study quality by using the Cochrane Checklist for Randomized studies. (Green is for Low, Yellow is for some and Red is for High).
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.