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.
Snow M, Coen-Cagli R, Schwartz O.Snow M, et al. Among authors: schwartz o.J Vis. 2016 Oct 1;16(13):1. doi: 10.1167/16.13.1.J Vis. 2016.PMID: 27699416Free PMC article.