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-occurrence network of author keywords with a minimum of 5 occurrences in FD research. A node size indicates the number of occurrences of an author keyword. An edge between nodes indicates that author keywords are commonly occurring. The greater the thickness of an edge, the more frequently an author keyword co-occurs with the other keyword. The color of a node indicates its category.
