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.
Harvey PR, Thomas T, Chandan JS, Bhala N, Nirantharakumar K, Trudgill NJ.Harvey PR, et al. Among authors: chandan js.BMJ Open. 2019 Jun 19;9(6):e026714. doi: 10.1136/bmjopen-2018-026714.BMJ Open. 2019.PMID: 31221879Free PMC article.