Figure 2. The funnel plot for the test of publication bias. The funnel plot for CG vs CC (A), GG vs CC (B), CG+GG vs CC (C), GG vs CG+CC (D), CG vs CC+GG (E), and G vs C (F).
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.