Figure 1.
The distribution of disease behavior over the first 7 years of disease. B1, nonstricturing, nonpenetrating disease; B2, stricturing disease; B3, penetrating disease.
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.