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.
Hoffart A, Bille H, Olsen B, Gude T, Mygind-Klausen O, Gilje B, Rolie JP, Thornes K.Hoffart A, et al. Among authors: gude t.Tidsskr Nor Laegeforen. 1990 Sep 20;110(22):2889-92.Tidsskr Nor Laegeforen. 1990.PMID: 2219069Norwegian.