Figure 1.
The workflow carried out in this study. The database, software, and/or web server used in each step are shown in parentheses.
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.