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.
The dashed lines represent the 95% confidence intervals. (A) The improvement rate of angina pectoris symptoms in the included studies. (B) The electrocardiogram improvement rate in the included studies.
