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.
Co-authorship analysis of countries and institutions. (A) Network map of co-authorship between countries with more than 15 publications. (B) Network map of co-authorship between institutions with more than 15 publications. (C) Network map of co-authorship between institutions with more than 15 publications according to average publication year (blue: earlier, yellow: later).
