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.
Patil CA, Bosschaart N, Keller MD, van Leeuwen TG, Mahadevan-Jansen A.Patil CA, et al. Among authors: keller md.Opt Lett. 2008 May 15;33(10):1135-7. doi: 10.1364/ol.33.001135.Opt Lett. 2008.PMID: 18483537Free PMC article.