Figure 8.
The author's keywords (A), keywords plus (B), titles (C), and abstracts (D) were used to extract the most relevant terms.
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.