Fig 5. Survey results 24 weeks after the start of the research.
IN: indigo naturalis; LI: Lichtiger index.
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.