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.
Thiels CA, Habermann EB, Hooten WM, Jeffery MM.Thiels CA, et al. Among authors: jeffery mm.BMJ. 2019 May 14;365:l1849. doi: 10.1136/bmj.l1849.BMJ. 2019.PMID: 31088782Free PMC article.