Fig. 2.
A model of structures, risk, and HIV: But should it be approached with a “billiard ball” model or an “interpenetrating others” model? (An earlier version of this figure appeared in the study Friedman and Reid (2002))
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.