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.
Funnel plot for publication bias from the studies on PEDV vaccine efficacy based on fecal score (a) and survival rate (b). The X-axis and the Y-axis of the funnel plot display effect size and standard error, respectively. The dark spots are the potential missing studies according to the trim-and-fill method.
