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.
Wedmann B, Sonnleitner E, Kemen M, Kalthoff L, Schmidt-Heinevetter G, Wegener M.Wedmann B, et al.Dtsch Med Wochenschr. 1991 Nov 8;116(45):1697-701. doi: 10.1055/s-2008-1063806.Dtsch Med Wochenschr. 1991.PMID: 1935651German.