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.
First author affiliation country in included publications. (A) Countries were clustered according to the World Bank classification and sorted by the number of occurrences in included publications. (B) Distribution of the countries according to World Bank major categories. Low-and middle-income country: aggregation of LIC, LMIC and UMIC categories. HIC, high-income country; LIC, low-income country; LMIC, lower-middle-income country; UMIC, upper-middle-income country.
