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.
Sankey diagram of the top ten elements in entities (note: nodes and edges are sizes by publications and flow momentum; the larger node means more publications; the wider edge represents more flow counts between 2 adjacent members; details are at the link[36]).
