Figure 4.
Funnel plot showing the 21 studies (open circles, on the right side) imputed by the trim-and-fill method to carry out a sensitivity analysis 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.