S2.
Kaplan-Meier curves demonstrating overall survival of patients stratified by nomogram-based risk group (P<0.001) (log-rank test).
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.