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.
Projected data was created by fitting a cubic model of months since enrollment to observed data and projecting values to future months. Grey shading indicates the time period for projected data.
