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–c) illustrate main findings on network graphs. These graphs represent cross-sections of each network (measured empirically during a linked sub-study; Shearer 2014. These figures are meant to be illustrative; locations of each finding, for example, are not related to specific nodes or relationships in the network.
