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.
Distribution of heart failure concepts extracted from different knowledge sources for signs or symptoms, causes or risk factors, diagnostic tests or results, and treatment. The numbers in the rectangles represent the corpus size (word count) of each source
