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.
(A) The knowledge map of keyword co-occurrence network in the MRD research field. (The labels indicate high betweenness centrality keywords). (B) The knowledge map of keyword clustering network in the MRD research field. (C) The keyword cloud.
