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.
Hagel BE, Pless B, Platt RW.Hagel BE, et al.Can J Public Health. 2003 Nov-Dec;94(6):458-62. doi: 10.1007/BF03405085.Can J Public Health. 2003.PMID: 14700247Free PMC article.