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.
Brendstrup T, Biering-Sørensen F.Brendstrup T, et al.Scand J Work Environ Health. 1987 Oct;13(5):445-52. doi: 10.5271/sjweh.2023.Scand J Work Environ Health. 1987.PMID: 2963374Free article.