Figure 3.
Top 50 author keywords found in MPV-related documents. Green, Red, Blue and Pink are the first four clusters; Red, the second; Yellow, the third; Blue, the fourth; and Pink, the fifth.
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.