An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Huonker M, Halle M, Frey I, Schmidt-Trucksäss A, Sorichter S, Keul J, Berg A.Huonker M, et al. Among authors: berg a.Z Kardiol. 1998 Nov;87(11):881-90. doi: 10.1007/s003920050244.Z Kardiol. 1998.PMID: 9885181Review.German.