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.
Johnson JK, Nápoles AM, Stewart AL, Max WB, Santoyo-Olsson J, Freyre R, Allison TA, Gregorich SE.Johnson JK, et al. Among authors: gregorich se.BMC Public Health. 2015 Oct 13;15:1049. doi: 10.1186/s12889-015-2395-9.BMC Public Health. 2015.PMID: 26463176Free PMC article.Clinical Trial.