Figure 4. Geographic distribution of articles.
A. Location of the corresponding author(s) for each of the 134 articles. B. Location of study populations for articles with available data.
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.