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.
CCHF collaborative research interactions based upon published articles. This visualizes work from 2009 to the present. Each interaction is represented by a connective ribbon, and the size of each ribbon is directly proportional to the number of interactions.
