Figure 1.
Flowchart depicting the literature search and study selection.
Notes: After removal of duplicates, reviews, and quality control, six papers were suitable for 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.