Figure 1.
Formation of the derivation and internal validation cohorts
Consort diagram displaying exclusion criteria for the study cohort, which was randomly split (70:30) into derivation and internal validation cohorts.
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.