Fig. 1.
Flow chart of article screening process. This flow chart describes how the included studies were selected for the systematic review and meta-analysis. The follow-up search conducted 3 months later added one study
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.