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.
Singh A, Sørensen TL.Singh A, et al.Acta Ophthalmol. 2012 Aug;90(5):476-80. doi: 10.1111/j.1755-3768.2010.02051.x. Epub 2010 Nov 25.Acta Ophthalmol. 2012.PMID: 21106047Free article.
Subhi Y, Singh A, Falk MK, Sørensen TL.Subhi Y, et al. Among authors: singh a.Clin Ophthalmol. 2014;8:15-21. doi: 10.2147/OPTH.S55080. Epub 2013 Dec 9.Clin Ophthalmol. 2014.PMID: 24363550Free PMC article.