Figure 6.
Timeline and overview of protocols. Basic protocols are highlighted in blue, support protocols in green, and alternative protocols in red. General timelines for protocols are listed below.
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.