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.
Henneken V, Bischoff-Everding C, Frank J, Scholz U, Hennig E, Hepp W.Henneken V, et al. Among authors: hepp w.Vasa Suppl. 1992;36:42-7.Vasa Suppl. 1992.PMID: 1529424German.