Figure 4.
The prevalence of OLP in urban, suburban, and rural populations all demonstrated an increasing pattern from 1996 to 2013 (p < 0.001).
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.