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.
Romano SN, Gorelick DA.Romano SN, et al. Among authors: gorelick da.J Vis Exp. 2014 May 17;(87):51533. doi: 10.3791/51533.J Vis Exp. 2014.PMID: 24894681Free PMC article.