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.
Lawrence MG, Kramarevsky NY, Christiansen SP, Wright MM, Young TL, Summers CG.Lawrence MG, et al. Among authors: christiansen sp.Trans Am Ophthalmol Soc. 2005;103:46-55.Trans Am Ophthalmol Soc. 2005.PMID: 17057787Free PMC article.