Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
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connected to the .gov website. Share sensitive
information only on official, secure websites.
Cohorts are derived from the Surveillance, Epidemiology, and End Results database (SEER), a shared equal-access Veterans Affairs regional hospital cohort (VA), and Radiation Therapy Oncology Group randomized clinical trials (RCT).
