Figure 2.
Funnel plot (with pseudo 95% confidence limits) to assess publication bias; Egger test for publication bias=0.751, 95% CI=0.0146–1.488, P=0.0467.
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.