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.
Bernat DH, Maldonado-Molina M, Hyland A, Wagenaar AC.Bernat DH, et al. Among authors: wagenaar ac.Am J Public Health. 2013 Feb;103(2):214-20. doi: 10.2105/AJPH.2012.300906. Epub 2012 Dec 13.Am J Public Health. 2013.PMID: 23237160Free PMC article.