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.
The numbers of publications (reviews excluded) were divided by the GDPs of 2011 (US$) from World Bank database and multiplied by 10 9.
Criteria A.
