An official website of the United States government
Here's how you know
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.
Example Children’s Oncology Group Clinical Trials or Clinical Trial Cohorts (Subtrials) Designed With Relaxed Type I Error Rates or Larger Targeted Effect Sizes (All With 80% Power)