Figure 1. Summary of literature search, screening and selection.
PRISMA flow diagram represents the literature search in different electronic data base followed by screening and inclusion of eligible studies for systematic review and meta-analysis.
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.