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.
“Withdrew” indicates subjects withdrew for reasons including scheduling conflicts, poor health, and lack of interest in continuing; “site decision,” that subjects were withdrawn by study sites because they repeatedly missed appointments or were uncooperative or disruptive during testing sessions.
