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.
(a) Stage 0 vs. Stage 1 vs. Stage 2 vs. Stage 3 vs. Stage 4; (b) Stage 0 vs. Stages 1,2,3,4 (c) Stages 0,1 vs. Stages 2,3,4 (d) Stages 0,1,2 vs. Stages 3,4 (e) Stages 0,1,2,3 vs. Stage 4.
