Figure 1.
Cardiovascular patients in 1000 people according to the calcium hardness in water in (a) 2010 and (b) 2011
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.