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.
Both groups decreased significantly between days 2 and 21; values at day 84 were significantly greater than those at either day 2 or 21.
