Table 2.
Example of a classified list of references using the introduced spatial and health categories. The full list can be found in the Supplementary Materials Table S1.
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.