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.
Flow chart showing identity verification process. Note: All interest forms received were processed for verification except for 2 that did not belong to US residents, listed as invalid above. However, only 1123 applicants were considered to be initially eligible for the study.
