FIGURE 3.
Begg’s funnel plot for publication bias tests in (A) OS and (B) DFS. Sensitivity analysis in (C) OS and (D) DFS.
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.