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.
Allebeck P, Mastekaasa A.Allebeck P, et al.Scand J Public Health Suppl. 2004;63:36-43. doi: 10.1080/14034950410021835.Scand J Public Health Suppl. 2004.PMID: 15513652