U.S. flag

An official website of the United States government

Government Website

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Safely connect using HTTPS

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.

  1. Home

Redirection Notice

You are now leaving the Department of Homeland Security's website and headed towards:

https://www.mdpi.com/2076-393X/11/2/386

Are you sure you want to proceed?

For more information, read the DHS.gov linking policy.