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.
White C, Fessler DMT.White C, et al. Among authors: fessler dmt.Evol Med Public Health. 2017 Dec 18;2018(1):34-42. doi: 10.1093/emph/eox018. eCollection 2018.Evol Med Public Health. 2017.PMID: 29492265Free PMC article.Review.