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.
Froehlich F, Fried M.Froehlich F, et al. Among authors: fried m.Schweiz Med Wochenschr. 1992 Aug 15;122(33):1219-20.Schweiz Med Wochenschr. 1992.PMID: 1529308German.