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.
Wilson A, Coveney J, Henderson J, Meyer S, Calnan M, Caraher M, Webb T, Elliott A, Ward P.Wilson A, et al.BMC Public Health. 2013 Mar 15;13:229. doi: 10.1186/1471-2458-13-229.BMC Public Health. 2013.PMID: 23496819Free PMC article.
Henderson J, House E, Coveney J, Meyer S, Ankeny R, Ward P, Calnan M.Henderson J, et al.BMC Public Health. 2013 Jun 19;13:596. doi: 10.1186/1471-2458-13-596.BMC Public Health. 2013.PMID: 23782688Free PMC article.