Figure 1.
The PRISMA flow chart summarizing the literature search and including studies from each database
PRISMA: Preferred reporting items for systematic reviews and meta-analyses
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.