FIGURE 6.
Meta-analysis of the effects of experimental group versus control group in terms of 1-, 2-, and 3-year survival.
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.