Figure 7.
Assessment for publication bias by funnel plot of the standard errors. The symmetrical distribution of the relationship between treatment effect and study size25 suggests a minimal risk for publication bias
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.