Figure 1.
Diagram of the data sources and entity relationships with integrative joins between the different data sources. The same color denotes information originating from the same data source.
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.