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.
Chen NK, Lee CL, Chi S.Chen NK, et al.Opt Express. 2007 Dec 24;15(26):17747-53. doi: 10.1364/oe.15.017747.Opt Express. 2007.PMID: 19551071Free article.
Chen NK, Hung CM, Chi S, Lai Y.Chen NK, et al.Opt Express. 2007 Dec 10;15(25):16448-56. doi: 10.1364/oe.15.016448.Opt Express. 2007.PMID: 19550935Free article.