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.
Sistrom M, Park D, O'Brien HE, Wang Z, Guttman DS, Townsend JP, Turner PE.Sistrom M, et al. Among authors: o brien he.PLoS One. 2015 Dec 15;10(12):e0144514. doi: 10.1371/journal.pone.0144514. eCollection 2015.PLoS One. 2015.PMID: 26670219Free PMC article.