Figure 1.
Kaplan-Meier Curves With Number at Risk of Overall Survival by 3 Comparison Cohorts. (A) Original Study Population. (B) Propensity Score–matched Population
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.